QuickLinks -- Click here to rapidly navigate through this document

Exhibit 1.1

7,500,000 Trust Units

MV OIL TRUST

UNDERWRITING AGREEMENT

St. Petersburg, Florida
[                        ], 2006

Raymond James & Associates, Inc.
As Representative of the Several Underwriters
    listed on Schedule I hereto
880 Carillon Parkway
St. Petersburg, Florida 33716

Ladies and Gentlemen:

        MV Partners, LLC, a Kansas limited liability company (the "Company"), proposes, subject to the terms and conditions stated herein, to sell to the several Underwriters named in Schedule I hereto (the "Underwriters"), an aggregate of 7,500,000 units of beneficial interest (the "Trust Units") in MV Oil Trust, a statutory trust formed under the laws of the State of Delaware (the "Trust"). The aggregate of 7,500,000 Trust Units to be purchased from the Company are called the "Firm Units." In addition, certain unitholders named in Schedule II hereto (the "Selling Unitholders") severally and not jointly propose, subject to the terms and conditions stated herein, have, agreed to sell to the Underwriters, upon the terms and conditions stated herein, up to an additional 1,125,000 Trust Units (the "Additional Units") to cover over-allotments by the Underwriters, if any. The Firm Units and the Additional Units are collectively referred to in this Agreement as the "Units." Raymond James & Associates, Inc. is acting as the representative of the several Underwriters and in such capacity is referred to in this Agreement as the "Representative."

        The Company wishes to confirm as follows its agreement with you and the other several Underwriters, on whose behalf you are acting, in connection with the several purchases of the Units from the Company.

        1.     Registration Statement and Prospectus. The Company has prepared and filed with the Securities and Exchange Commission (the "Commission") in accordance with the provisions of the Securities Act of 1933, as amended, and the rules and regulations of the Commission thereunder (collectively, the "Act"), a registration statement on Form S-1 (File No. 333-136609), including a prospectus subject to completion, relating to the Units. Such registration statement, as amended, including the financial statements, exhibits and schedules thereto, at the time when it becomes effective and as thereafter amended by any post-effective amendment, is referred to in this Agreement as the "Registration Statement." The prospectus in the form included in the Registration Statement or, if the prospectus included in the Registration Statement omits certain information in reliance upon Rule 430A under the Act and such information is thereafter included in a prospectus filed with the Commission pursuant to Rule 424(b) under the Act or as part of a post-effective amendment to the Registration Statement after the Registration Statement becomes effective, the prospectus as so filed, is referred to in this Agreement as the "Prospectus." If the Company files another registration statement with the Commission to register a portion of the Units pursuant to Rule 462(b) under the Act (the "Rule 462 Registration Statement"), then any reference to "Registration Statement" herein shall be deemed to include the registration statement on Form S-1 (File No. 333-136609) and the Rule 462 Registration Statement, as each such registration statement may be amended pursuant to the Act. The prospectus subject to completion in the form included in the Registration Statement at the time of the initial filing of such Registration Statement with the Commission and as such prospectus is amended from time to time until the date of the Prospectus is referred to in this Agreement as the "Preliminary Prospectus." For purposes of this Agreement, "free writing prospectus" has the meaning ascribed to it in Rule 405

under the Act, and "Issuer Free Writing Prospectus" shall mean each free writing prospectus prepared by or on behalf of the Company or used or referred to by the Company in connection with the offering of the Units. "Time of Sale Information" shall mean the Preliminary Prospectus together with the free writing prospectuses, if any, each identified in Schedule III hereto. All references in this Agreement to the Registration Statement, the Rule 462 Registration Statement, a Preliminary Prospectus, the Prospectus or the Time of Sale Information, or any amendments or supplements to any of the foregoing, shall be deemed to refer to and include any documents incorporated by reference therein, and shall include any copy thereof filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval System ("EDGAR").

        2.     Agreements to Sell and Purchase. The Company hereby agrees to issue and sell the Firm Units to the Underwriters and, upon the basis of the representations, warranties and agreements of the Company herein contained and subject to all the terms and conditions set forth herein, each Underwriter agrees, severally and not jointly, to purchase from the Company at a purchase price of $[            ] per Unit (the "purchase price per Unit"), the number of Firm Units set forth opposite the name of such Underwriter in Schedule I hereto.

        The Selling Unitholders hereby agree to sell to the Underwriters, and, upon the basis of the representations, warranties and agreements of the Selling Unitholders herein contained and subject to all the terms and conditions set forth herein, the Underwriters shall have the right for 30 days from the date of the Prospectus to purchase from the Selling Unitholders up to 1,125,000 Additional Units at the purchase price per Unit for the Firm Units, each Selling Unitholder selling that number of Additional Units that bears the same proportion to the total number of Additional Units to be purchased by the Underwriters as the number of Firm Units set forth opposite the name of such Selling Unitholder in Schedule II hereto bears to the total number of Firm Units. The Additional Units may be purchased solely for the purpose of covering over-allotments, if any, made in connection with the offering of the Firm Units. If any Additional Units are to be purchased, each Underwriter, severally and not jointly, agrees to purchase the number of Additional Units (subject to such adjustments as you may determine to avoid fractional units) that bears the same proportion to the total number of Additional Units to be purchased by the Underwriters as the number of Units set forth opposite the name of such Underwriter in Schedule I hereto bears to the total number of Units. The option to purchase Additional Units may be exercised at any time within 30 days after the date of the Prospectus, but no more than once.

        3.     Terms of Public Offering. The Company has been advised by you that the Underwriters propose to make a public offering of their respective portions of the Units as soon after the Registration Statement and this Agreement have become effective as in your judgment is advisable and initially to offer the Units upon the terms set forth in the Prospectus.

        Not later than 12:00 p.m. on the second business day following the date the Units are released by the Underwriters for sale to the public, the Company shall deliver or cause to be delivered copies of the Prospectus in such quantities and at such places as the Representative shall request.

        4.     Delivery of the Units and Payment Therefor. Delivery to the Underwriters of the Firm Units and payment therefor shall be made at the offices of Baker Botts L.L.P., 910 Louisiana, Houston, Texas at 10:00 a.m., St. Petersburg, Florida time, on [                        ], 2006 or such other place, time and date not later than 1:30 p.m., St. Petersburg, Florida time, on [                        ], 2006 as the Representative shall designate by notice to the Company (the time and date of such closing are called the "Closing Date"). The place of closing for the Firm Units and the Closing Date may be varied by agreement between the Representative and the Company. The Company hereby acknowledges that circumstances under which the Representative may provide notice to postpone the Closing Date as originally scheduled include any determination by the Company or the Representative to recirculate to the public

2

copies of an amended or supplemented Prospectus or a delay as contemplated by the provisions of Section 11 hereof.

        Delivery to the Underwriters of and payment for any Additional Units to be purchased by the Underwriters shall be made at the offices of [Baker Botts, L.L.P., 910 Louisiana, Houston, Texas] at 10:00 a.m., St. Petersburg, Florida time, on such date or dates (the "Additional Closing Date") (which may be the same as the Closing Date, but shall in no event be earlier than the Closing Date nor earlier than three nor later than ten business days after the giving of the notice hereinafter referred to) as shall be specified in a written notice, from the Representative on behalf of the Underwriters to the Selling Unitholders, of the Underwriters' determination to purchase a number, specified in such notice, of Additional Units. Such notice may be given at any time within 30 days after the date of the Prospectus and must set forth (i) the aggregate number of Additional Units as to which the Underwriters are exercising the option and (ii) the names and denominations in which the certificates for which the Additional Units are to be registered. The place of closing for the Additional Units and the Additional Closing Date may be varied by agreement between you and the Company.

        Certificates for the Firm Units and for any Additional Units to be purchased hereunder shall be delivered through the facilities of The Depository Trust Company ("DTC"). The certificates evidencing the Firm Units and any Additional Units to be purchased hereunder shall be delivered to you on the Closing Date or the Additional Closing Date, as the case may be, against payment of the purchase price therefore by wire transfer of immediately available funds to an accounts specified in writing, not later than the close of business on the business day next preceding the Closing Date or the Additional Closing Date, as the case may be, by the Company. Payment for the Units sold by the Company hereunder shall be delivered by the Representative to the Company. Payment for the Additional Units sold by the Selling Unitholders hereunder, if any, shall be delivered by the Representative to the Custodian (as defined herein).

        It is understood that the Representative has been authorized, for its own account and the accounts of the several Underwriters, to accept delivery of and receipt for, and make payment of the purchase price per Unit for the Firm Units and the Additional Units, if any, that the Underwriters have agreed to purchase. Raymond James and Associates, Inc., individually and not as Representative of the Underwriters, may, but shall not be obligated to, make payment for any Units to be purchased by any Underwriter whose funds shall not have been received by the Representative by the Closing Date or the Additional Closing Date, as the case may be, for the account of such Underwriter, but any such payment shall not relieve such Underwriter from any of its obligations under this Agreement.

        Each of the Company and the Selling Unitholders hereby agrees that it will pay all stock transfer taxes, stamp duties and other similar taxes, if any, payable upon the sale or delivery of the Units to be sold by the Company or the Selling Unitholder, respectively, to the several Underwriters, or otherwise in connection with the performance of the Company's or such Selling Unitholder's respective obligations hereunder. Each of the Selling Unitholders hereby agrees that the Custodian is authorized to deduct for such payment any such amounts from the proceeds to such Selling Unitholder hereunder and to hold such amounts for the account of such Selling Unitholder with the Custodian under the Custody Agreement (as defined herein).

        5.     Covenants and Agreements.

        5.1   Of the Company. The Company covenants and agrees with the several Underwriters as follows:

        (a)   The Company will use its best efforts to cause the Registration Statement and any amendments thereto to become effective, if it has not already become effective, and will advise you promptly and, if requested by you, will confirm such advice in writing (i) when the Registration Statement has become effective and the time and date of any filing of any post-effective Registration Statement or any amendment or supplement to any Preliminary Prospectus or the Prospectus and the

3

time and date that any post-effective amendment to the Registration Statement becomes effective, (ii) if Rule 430A under the Act is employed, when the Prospectus has been timely filed pursuant to Rule 424(b) under the Act, (iii) of the receipt of any comments of the Commission, or any request by the Commission for amendments or supplements to the Registration Statement, any Preliminary Prospectus or the Prospectus or for additional information, (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of the suspension of qualification of the Units for offering or sale in any jurisdiction or the initiation of any proceeding for such purposes and (v) within the period of time referred to in Section 5(h) below, of any change in the Company's condition (financial or other), business, prospects, properties, net worth or results of operations, or of any event that comes to the attention of the Company that makes any statement made in the Registration Statement or the Prospectus (as then amended or supplemented) untrue in any material respect or that requires the making of any additions thereto or changes therein in order to make the statements therein (in the case of the Prospectus, in light of the circumstances under which they were made) not misleading in any material respect, or of the necessity to amend or supplement the Prospectus (as then amended or supplemented) to comply with the Act or any other law. If at any time the Commission shall issue any stop order suspending the effectiveness of the Registration Statement, the Company will make every reasonable effort to obtain the withdrawal or lifting of such order at the earliest possible time. The Company will provide the Underwriters with copies of the form of Prospectus, in such number as the Underwriters may reasonably request, and file with the Commission such Prospectus in accordance with Rule 424(b) of the Act before the close of business on the first business day immediately following the date hereof.

        (b)   The Company will furnish to you, without charge, two signed duplicate originals of the Registration Statement as originally filed with the Commission and of each amendment thereto, including financial statements and all exhibits thereto, and will also furnish to you, without charge, such number of conformed copies of the Registration Statement as originally filed and of each amendment thereto as you may reasonably request.

        (c)   The Company will promptly file with the Commission any amendment or supplement to the Registration Statement or the Prospectus that may, in the judgment of the Company or the Representatives be required by the Act or requested by the Commission.

        (d)   The Company will furnish a copy of any amendment or supplement to the Registration Statement or to the Prospectus or any Issuer Free Writing Prospectus to you and counsel for Underwriters and obtain your consent prior to filing any of those with the Commission.

        (e)   The Company will not make any offer relating to the Trust Units that would constitute an Issuer Free Writing Prospectus without your prior consent.

        (f)    The Company will retain in accordance with the Act all Issuer Free Writing Prospectuses not required to be filed pursuant to the Act; and if at any time after the date hereof any events shall have occurred as a result of which any Issuer Free Writing Prospectus, as then amended or supplemented, would conflict with the information in the Registration Statement, the most recent Preliminary Prospectus or the Prospectus or would include an untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, or, if for any other reason it shall be necessary to amend or supplement any Issuer Free Writing Prospectus, to notify you and, upon your request, to file such document and to prepare and furnish without charge to each Underwriter as many copies as they may from time to time reasonably request of an amended or supplemented Issuer Free Writing Prospectus that will correct such conflict, statement or omission or effect such compliance.

        (g)   Prior to the execution and delivery of this Agreement, the Company has delivered or will deliver to you, without charge, in such quantities as you have requested or may hereafter reasonably request, copies of each form of the Preliminary Prospectus. Consistent with the provisions of

4

Section 5(h) hereof, the Company consents to the use, in accordance with the provisions of the Act and with the securities or Blue Sky laws of the jurisdictions in which the Units are offered by the several Underwriters and by dealers, prior to the date of the Prospectus, of each Preliminary Prospectus so furnished by the Company.

        (h)   As soon after the execution and delivery of this Agreement as is practicable and thereafter from time to time for such period as in the reasonable opinion of counsel for the Underwriters a prospectus is required by the Act to be delivered in connection with sales by any Underwriter or a dealer (the "Prospectus Delivery Period"), and for so long a period as you may request for the distribution of the Units, the Company will deliver to each Underwriter and each dealer, without charge, as many copies of the Prospectus and the Time of Sale Information (and of any amendment or supplement thereto) as they may reasonably request. The Company consents to the use of the Prospectus and the Time of Sale Information (and of any amendment or supplement thereto) in accordance with the provisions of the Act and with the securities or Blue Sky laws of the jurisdictions in which the Units are offered by the several Underwriters and by all dealers to whom Units may be sold, both in connection with the offering and sale of the Units and for such period of time thereafter as the Prospectus is required by the Act to be delivered in connection with sales by any Underwriter or dealer. If at any time prior to the later of (i) the completion of the distribution of the Units pursuant to the offering contemplated by the Registration Statement or (ii) the expiration of prospectus delivery requirements with respect to the Units under Section 4(3) of the Act and Rule 174 thereunder, any event shall occur that in the judgment of the Company or in the opinion of counsel for the Underwriters is required to be set forth in the Prospectus (as then amended or supplemented) or should be set forth therein in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, or if it is necessary to supplement or amend the Prospectus to comply with the Act or any other law, the Company will forthwith prepare and, subject to Section 5(a) hereof, file with the Commission and use its best efforts to cause to become effective as promptly as possible an appropriate supplement or amendment thereto, and will furnish to each Underwriter who has previously requested Prospectuses, without charge, a reasonable number of copies thereof.

        (i)    The Company will cooperate with you and counsel for the Underwriters in connection with the registration or qualification of the Units for offering and sale by the several Underwriters and by dealers under the securities or Blue Sky laws of such jurisdictions as you may reasonably designate and will file such consents to service of process or other documents as may be reasonably necessary in order to effect and maintain such registration or qualification for so long as required to complete the distribution of the Units; provided that in no event shall the Company be obligated to qualify to do business in any jurisdiction where it is not now so qualified or to take any action that would subject it to general service of process in suits, other than those arising out of the offering or sale of the Units, as contemplated by this Agreement and the Prospectus, in any jurisdiction where it is not now so subject. In the event that the qualification of the Units in any jurisdiction is suspended, the Company shall so advise you promptly in writing. The Company will use its best efforts to qualify or register the Trust Units for sale in non-issuer transactions under (or obtain exemptions from the application of) the Blue Sky laws of each state where necessary to permit market making transactions and secondary trading and will comply with such Blue Sky laws and will continue such qualifications, registrations and exemptions in effect for a period of five years after the date hereof.

        (j)    If this Agreement shall terminate or shall be terminated after execution pursuant to any provision hereof (except pursuant to a termination under Section 12 hereof) or if this Agreement shall be terminated by the Underwriters because of any inability, failure or refusal on the part of the Company to perform in all material respects any agreement herein or to comply in all material respects with any of the terms or provisions hereof or to fulfill in all material respects any of the conditions of this Agreement, the Company agrees to reimburse you and the other Underwriters for all out-of-pocket

5

expenses (including travel expenses and reasonable fees and expenses of counsel for the Underwriters, but excluding wages and salaries paid by you) reasonably incurred by you in connection herewith.

        (k)   The Company will apply the net proceeds from the sale of the Units to be sold by it hereunder in accordance in all material respects with the statements under the caption "Use of Proceeds" in the Prospectus.

        (l)    For a period commencing on the date hereof and ending on the 180th day after the date of the Prospectus (the "Lock-Up Period"), not to, directly or indirectly, (i) offer for sale, sell, pledge or otherwise dispose of (or enter into any transaction or device that is designed to, or could be expected to, result in the disposition by any person at any time in the future of) any Trust Units, or other securities of the Trust, or other securities that are derived from the Subject Interests (as defined in the Conveyance, which is defined in Section 6(m) of this Agreement) that are substantially similar to the Trust Units, or securities convertible into or exchangeable for Trust Units, or sell or grant options, rights or warrants with respect to any Trust Units or securities convertible into or exchangeable for Trust Units (collectively, "Trust Securities"), (ii) enter into any swap or other derivatives transaction that transfers to another, in whole or in part, any of the economic benefits or risks of ownership of such Trust Units, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Trust Units or other securities, in cash or otherwise or (iii) publicly disclose the intention to do any of the foregoing, in each case without the prior written consent of the Representative on behalf of the Underwriters; notwithstanding the foregoing, if (i) during the last 17 days of the Lock-Up Period, the Trust issues a release concerning distributable cash or announces material news or a material event relating to the Trust occurs or (ii) prior to the expiration of the Lock-Up Period, the Trust announces that it will release distributable cash results during the 16-day period beginning on the last day of the Lock-Up Period, then the restrictions imposed in the preceding paragraph shall continue to apply until the expiration of the 18-day period beginning on the date of issuance of the earnings release or the announcement of the material news or the occurrence of the material event, unless the Representative, on behalf of the Underwriters, waives such extension in writing.

        (m)  Prior to the Closing Date or the Additional Closing Date, as the case may be, the Company will furnish to you, as promptly as possible, copies of any unaudited interim consolidated financial statements of the Company and its subsidiaries for any period subsequent to the periods covered by the financial statements appearing in the Prospectus.

        (n)   The Company will comply with all provisions of any undertakings contained in the Registration Statement.

        (o)   The Company will not at any time, directly or indirectly, take any action designed, or which might reasonably be expected to cause or result in, or which will constitute, stabilization or manipulation of the price of the Trust Units to facilitate the sale or resale of any of the Units.

        (p)   The Company will timely file with the New York Stock Exchange (the "NYSE") all documents and notices required by the NYSE of companies that have or will issue securities that are traded on the NYSE.

        (q)   The Company shall engage and maintain, at its expense, a transfer agent and, if necessary under the jurisdiction of its incorporation or the rules of any national securities exchange on which the Trust Units will be listed, a registrar (which, if permitted by applicable laws and rules may be the same entity as the transfer agent) for the Trust Units.

        (r)   On the Closing Date, all stock transfer and other taxes (other than income taxes) that are required to be paid in connection with the sale and transfer of the Firm Units to be sold by the Company to the Underwriters hereunder will have been fully paid for by the Company and all laws imposing such taxes will have been fully complied with.

6

        (s)   In order to document the Underwriters' compliance with the reporting and withholding provisions of the Internal Revenue Code of 1986, as amended (the "Code"), and the regulations promulgated thereunder, with respect to the transactions herein contemplated, the Company shall deliver to you at least two days prior to the Closing Date a properly completed and executed United States Treasury Department Substitute Form W-9.

        5.2   Of the Trust. The Trustee, on behalf of the Trust, covenants and agrees with the several Underwriters as follows:

        (a)   To cause the Trust to make generally available to holders of the Trust Units a consolidated earnings statement (in form complying with the provisions of Rule 158), which need not be audited, covering a 12-month period commencing after the effective date of the Registration Statement and the Rule 462 Registration Statement, if any, and ending not later than 15 months thereafter, as soon as practicable after the end of such period, which consolidated earnings statement shall satisfy the provisions of Section 11(a) of the Act.

        (b)   To cause the Trust to furnish to holders of the Trust Units as soon as practicable after the end of each fiscal year an annual report (including financial statements of the Trust certified by independent public accountants) and, as soon as practicable after the end of each of the first three quarters of each fiscal year (beginning with the fiscal quarter ending after the effective date of the Registration Statement), to make available to holders of the Trust Units summary financial information of the Trust for such quarter in reasonable detail.

        (c)   During the period ending five years from the date hereof, to cause the Trust to furnish to you and, upon your request, to each of the other Underwriters, (i) as soon as available, a copy of each proxy statement, quarterly or annual report or other report of the Trust mailed to unitholders or filed with the Commission, the National Association of Securities Dealers, Inc. (the "NASD") or the NYSE or any national securities exchange and (ii) from time to time such other information concerning the Trust as you may reasonably request.

        5.3   Of Each Selling Unitholder. Each Selling Unitholder covenants and agrees with the several Underwriters as follows:

        (a)   Such Selling Unitholder will execute and deliver a Lock-Up Agreement, in the form of Exhibit A attached hereto ("Lock-Up Agreement").

        (b)   Such Selling Unitholder will review the Prospectus and will comply with all agreements and satisfy all conditions on its part to be complied with or satisfied pursuant to this Agreement on or prior to the Closing Date or the Additional Closing Date, as the case may be, and will advise the Underwriters prior to the Closing Date or the Additional Closing Date, as the case may be, if any statements to be made on behalf of such Selling Unitholder in the certificate contemplated by Section 9(n) hereof would be inaccurate if made as of the Closing Date or Additional Closing Date, as the case may be.

        (c)   On the Additional Closing Date, all stock transfer and other taxes (other than income taxes) that are required to be paid in connection with the sale and transfer of the Additional Units to be sold by such Selling Unitholder to the Underwriters hereunder, if any, will have been fully paid for by such Selling Unitholder and all laws imposing such taxes will have been fully complied with.

        (d)   In order to document the Underwriters' compliance with the reporting and withholding provisions of the Code, and the regulations promulgated thereunder, with respect to the transactions herein contemplated, such Selling Unitholder shall deliver to you at least two days prior to the Additional Closing Date, if any, a properly completed and executed United States Treasury Department Substitute Form W-9.

7

        6.     Representations and Warranties.

        6.1   Of the Company. The Company hereby represents and warrants to each Underwriter on the date hereof, and shall be deemed to represent and warrant to each Underwriter on the Closing Date and the Additional Closing Date, as the case may be, that:

        (a)   The Company was not at the time of initial filing of the Registration Statement and at the earliest time thereafter that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) of the Act) of the Trust Units, is not on the date hereof and will not be on the applicable Delivery Date an "ineligible issuer" (as defined in Rule 405).

        (b)   The Registration Statement conformed, and any amendment to the Registration Statement filed after the date hereof will conform in all material respects when filed, to the requirements of the Act. The most recent Preliminary Prospectus conformed, and the Prospectus will conform, to the requirements of the Act in all material respects when filed with the Commission pursuant to Rule 424(b).

        (c)   The Registration Statement does not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Registration Statement in reliance upon and in conformity with written information furnished to the Company through the Representative by or on behalf of any Underwriter specifically for inclusion therein.

        (d)   The Prospectus will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Prospectus in reliance upon and in conformity with written information furnished to the Company through the Representative by or on behalf of any Underwriter specifically for inclusion therein.

        (e)   The Time of Sale Information does not, and will not at the time of sale of the Units, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Time of Sale Information in reliance upon and in conformity with written information furnished to the Company through the Representative by or on behalf of any Underwriter specifically for inclusion therein.

        (f)    Each Issuer Free Writing Prospectus (including, without limitation, any road show that is a free writing prospectus under Rule 433), when considered together with the Time of Sale Information at the time of sale of the Units, did not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

        (g)   Each Issuer Free Writing Prospectus conformed or will conform in all material respects to the requirements of the Act on the date of first use, and the Company has complied with all prospectus delivery and any filing requirements applicable to such Issuer Free Writing Prospectus pursuant to the Act. The Company has not made any offer relating to the Trust Units that would constitute an Issuer Free Writing Prospectus without the prior written consent of the Representatives. The Company has retained in accordance with the Act all Issuer Free Writing Prospectuses that were not required to be filed pursuant to the Act. The Company has taken all actions necessary so that any "road show" (as defined in Rule 433) in connection with the offering of the Trust Units will not be required to be filed pursuant to the Act.

8

        (h)   Each of the Company and its subsidiaries is a corporation or limited liability company duly organized and validly existing as a corporation or limited liability company, as the case may be, in good standing under the laws of the state of its incorporation or organization with full corporate power and authority to own, lease and operate its properties and to conduct its business as presently conducted and as described in the Registration Statement, the Time of Sale Information and the Prospectus (and any amendment or supplement thereto) and is duly registered and qualified to conduct its business and is in good standing in each jurisdiction or place where the nature of its properties or the conduct of its business requires such registration or qualification, except where the failure to so register or qualify has not had or will not have a material adverse effect on the condition (financial or other), business, properties, net worth, results of operations or prospects of the Company and its subsidiaries, taken as a whole (a "Material Adverse Effect").

        (i)    The Trust is duly organized and validly existing as a statutory trust in good standing under the laws of the State of Delaware with full trust power and authority to own its properties as described in the Registration Statement, the Time of Sale Information and the Prospectus (and any amendment or supplement thereto).

        (j)    There are no legal or governmental proceedings pending or, to the best knowledge of the Company, threatened, against the Company or its subsidiaries or to which the Company or its subsidiaries or any of their properties, including the Subject Interests, are subject, that are required to be described in the Registration Statement or the Prospectus (or any amendment or supplement thereto) but are not described as required. Except as described in the Registration Statement, the Time of Sale Information and Prospectus, there is no action, suit, inquiry, proceeding or investigation by or before any court or governmental or other regulatory or administrative agency or commission pending or, to the best knowledge of the Company, threatened, against or involving the Company or its subsidiaries, which might individually or in the aggregate prevent or adversely affect the transactions contemplated by this Agreement or would have a material adverse effect on the Term Net Profits Interest (as defined in the Conveyance) or result in a Material Adverse Effect, nor to the Company's knowledge, is there any basis for any such action, suit, inquiry, proceeding or investigation. There are no agreements, contracts, indentures, leases or other instruments that are required to be described in the Registration Statement, the Time of Sale Information or the Prospectus (or any amendment or supplement thereto) or to be filed as an exhibit to the Registration Statement that are not described, filed or incorporated by reference in the Registration Statement, the Time of Sale Information and the Prospectus as required by the Act. All such contracts to which the Company or any of its subsidiaries is a party have been duly authorized, executed and delivered by the Company or the applicable subsidiary, constitute valid and binding agreements of the Company or the applicable subsidiary and are enforceable against the Company or the applicable subsidiary in accordance with the terms thereof, except as enforceability thereof may be limited by (i) the application of bankruptcy, reorganization, insolvency and other laws affecting creditors' rights generally and (ii) equitable principles being applied at the discretion of a court before which any proceeding may be brought. Neither the Company nor the applicable subsidiary has received notice or been made aware that any other party is in breach of or default to the Company under any of such contracts.

        (k)   Neither the Company nor any of its subsidiaries is (i) in violation of (A) its certificate or articles of incorporation or organization or bylaws, or other organizational documents or agreements, (B) any law, ordinance, administrative or governmental rule or regulation applicable to the Company or any of its subsidiaries, the violation of which would have a Material Adverse Effect or (C) any decree of any court or governmental agency or body having jurisdiction over the Company or any of its subsidiaries; or (ii) in default in any material respect in the performance of any obligation, agreement or condition contained in (A) any bond, debenture, note or any other evidence of indebtedness or (B) any agreement, indenture, lease or other instrument (each of (A) and (B), an "Existing Instrument") to which the Company or any of its subsidiaries is a party or by which any of their

9

properties may be bound, which default would have a Material Adverse Effect; and there does not exist any state of facts that constitutes an event of default on the part of the Company or any of its subsidiaries as defined in such documents or that, with notice or lapse of time or both, would constitute such an event of default.

        (l)    Each of this Agreement and the organizational trust agreement (the "Organizational Trust Agreement") by and among the Company, The Bank of New York Trust Company, N.A., as trustee (the "Trustee"), and Wilmington Trust Company, as Delaware trustee (the "Delaware Trustee"), has been duly authorized, executed and delivered by the Company; each of the amended and restated trust agreement (the "Trust Agreement") by and among the Company, the Trustee and the Delaware Trustee; and the administrative services agreement (the "Administrative Services Agreement") between the Company and the Trust, each in the form to be in effect as of the Closing Date and the Additional Closing Date, as the case may be, has been duly authorized and will be duly executed and delivered by the Company; and the Organizational Trust Agreement constitutes, and each of the Trust Agreement and the Administrative Services Agreement when duly executed and delivered by the Company and the other parties thereto will constitute, a valid and legally binding agreement of the Company, enforceable against the Company in accordance with its terms, except to the extent enforceability may be limited by (i) the application of bankruptcy, reorganization, insolvency and other laws affecting creditors' rights generally and (ii) equitable principles being applied at the discretion of a court before which any proceeding may be brought. The holders of the Trust Units are entitled to the benefits of the Trust Agreement.

        (m)  The Term Net Profits Interest Conveyance (the "Conveyance") by and between the Company and the Trust has been duly authorized and, when duly executed by the proper officers of the Company (assuming due execution and delivery by the Trustee and the Delaware Trustee) and delivered by the Company to the Trust will constitute valid and binding agreements of the Company enforceable against the Company in accordance with its terms, except as the enforceability of each may be limited by (i) the application of bankruptcy, reorganization, insolvency and other laws affecting creditors' rights generally and (ii) equitable principles being applied at the discretion of a court before which any proceeding may be brought; the form of the Conveyance complies with the laws of each of the states in which such Conveyance is to be recorded or filed, including all applicable recording, filing and registration laws and regulations, and is adequate and sufficient to transfer title to the Term Net Profits Interest to the Trust; the recording of the Conveyance in the real property records in each county where the Subject Interests are located is sufficient to impart notice of the contents thereof, and all subsequent purchasers or creditors of the Company will be deemed to purchase with notice of and subject to such Term Net Profits Interest; prior to the Closing Date, the Company will have made or transmitted for filing all necessary recordings and filings of the Conveyance; the Conveyance and the Term Net Profits Interest conform in all material respects to the descriptions thereof in the Prospectus; all Term Net Profits Interest described in the Prospectus are accurately described in the exhibits attached to the Conveyance; and prior to the Closing Date 11,500,000 Trust Units shall have been issued by the Trust to the Company in consideration for the conveyance by the Company to the Trust of the Term Net Profits Interest pursuant to the Conveyance; on the Closing Date and the Additional Closing Date, as the case may be, 11,500,000 Trust Units will be issued and outstanding.

        (n)   The Trust Units have been duly authorized by the Trust, and, when duly issued and delivered to the Company in accordance with the Trust Agreement, the Trust Units will be duly and validly issued and outstanding, fully paid and nonassessable and are free of any preemptive or similar rights, and will constitute valid and binding obligations of the Trust entitled to the benefits of the Trust Agreement and enforceable in accordance with their terms, except as the enforceability of each may be limited by (i) the application of bankruptcy, reorganization, insolvency and other laws affecting creditors' rights generally and (ii) equitable principles being applied at the discretion of a court before which any

10

proceeding may be brought. The Trust Units, when issued and delivered, will conform in all material respects to the description thereof contained in the Prospectus.

        (o)   The Company has and, on the Closing Date and the Additional Closing Date, as the case may be, will have good and valid title to the Trust Units to be sold by the Company hereunder, free and clear of all liens, encumbrances, equities or claims whatsoever, and the Company has full corporate power and authority to sell, assign, transfer and deliver such Trust Units hereunder; and, upon the delivery of such Trust Units and payment therefor pursuant hereto, good and valid title to such Trust Units, free and clear of all liens, encumbrances, equities or claims, will pass to the several Underwriters.

        (p)   All consents, approvals, authorizations and orders necessary for the transfer of the Term Net Profits Interest to the Trust as described in the Prospectus have been obtained and such transfer has not had the effect of creating, and there does not exist, any lien, claim, encumbrance or equity of any kind in favor of any person with respect to any of the Term Net Profits Interest except (i) to the extent such rights have been validly waived in writing or (ii) to the extent such liens, claims, encumbrances or equities, which, if asserted or exercised, would not have a material adverse effect on the value of the Trust Units.

        (q)   None of the (i) formation of the Trust by the execution and delivery of the Organizational Trust Agreement, (ii) the transfer of the Term Net Profits Interest by the Company to the Trust by the execution and delivery of the Conveyance, (iii) the sale of the Firm Units by the Company or (iv) the execution, delivery or performance of this Agreement, the Organizational Trust Agreement, the Trust Agreement, the Administrative Services Agreement and the Conveyance by the Company and the Trust nor the consummation by the Company and the Trust of the transactions contemplated hereby (i) requires any consent, approval, authorization or other order of or registration or filing with, any court, regulatory body, administrative agency or other governmental body, agency or official (except such as may be required for the registration of the Units under the Act, the listing of the Units for trading on the NYSE, the registration of the Trust Units under the Securities Exchange Act of 1934, as amended, and the rules and regulations of the Commission thereunder (collectively, the "Exchange Act") and compliance with the securities or Blue Sky laws of various jurisdictions, all of which will be, or have been, effected in accordance with this Agreement and except for the NASD's clearance of the underwriting terms of the offering contemplated hereby as required under the NASD's Rules of Fair Practice), (ii) conflicts with or will conflict with or constitutes or will constitute a breach of, or a default under, the Company's articles of organization or operating agreement or any agreement, indenture, lease or other instrument to which the Company or any of its subsidiaries is a party or by which any of its properties may be bound, (iii) violates any statute, law, regulation, ruling, filing, judgment, injunction, order or decree applicable to the Company or any of its subsidiaries or any of their properties, or (iv) results in a breach of, or default or Debt Repayment Triggering event (as defined below) under, or results in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its subsidiaries pursuant to, or requires the consent of any other party to, any Existing Instrument, except as disclosed in the Prospectus and except for such conflicts, breaches, defaults, liens, charges or encumbrances that will not, individually or in the aggregate, result in a Material Adverse Effect. As used herein, a "Debt Repayment Triggering Event" means any event or condition that gives, or with the giving of notice or lapse of time would give, the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder's behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Company or any of its subsidiaries.

        (r)   Except as described in the Time of Sale Information and the Prospectus, neither the Company nor any of its subsidiaries has outstanding and at the Closing Date and the Additional Closing Date, as the case may be, will have outstanding any options to purchase, or any warrants to subscribe for, or any

11

securities or obligations convertible into, or any contracts or commitments to issue or sell, any Trust Units or any such warrants or convertible securities or obligations.

        (s)   Grant Thornton LLP, the certified public accountants who have certified the financial statements of the Company, the Trust and the Underlying Properties (as defined in the Conveyance) (including the related notes thereto and supporting schedules) filed as part of the Registration Statement and the Prospectus (or any amendment or supplement thereto), are independent public accountants as required by the Act.

        (t)    The financial statements, together with related schedules and notes, included in the Registration Statement, the Time of Sale Information and the Prospectus (and any amendment or supplement thereto), present fairly the financial condition, results of operations, cash flows and changes in financial position of the Company, the Trust and the Underlying Properties on the basis stated in the Registration Statement at the respective dates or for the respective periods to which they apply; such statements and related schedules and notes have been prepared in accordance with generally accepted accounting principles consistently applied throughout the periods involved, except as disclosed therein; and the other financial and statistical information and data set forth in the Registration Statement and Prospectus (and any amendment or supplement thereto) is accurately presented and prepared on a basis consistent with such financial statements and the books and records of the Company. The pro forma financial statements together with related notes thereto included in the Registration Statement and the Prospectus (and any amendment or supplement thereto) present fairly the information contained therein, have been prepared in accordance with the Commission's rules and regulations with respect to pro forma financial statements and have been properly presented on the bases described therein. Additionally, the assumptions used in the preparation thereof are reasonable and the adjustments used therein are appropriate to give effect to the transactions and circumstances referred to therein. No other financial statements or schedules are required to be included in the Registration Statement.

        (u)   The information supplied by the Company to Cawley, Gillespie & Associates, Inc. ("Cawley Gillespie"), independent petroleum engineers, for purposes of preparing the reserve reports and estimates of Cawley Gillespie included in the Registration Statement, including, without limitation, production, costs of operation and development, current prices for production, agreements relating to current and future operations and sales of production, was true and correct in all material respects on the date supplied and was prepared in accordance with customary industry practices; Cawley Gillespie, whose report on reserves is attached as Appendix A to the Prospectus were, as of the date of such report, and are, as of the date hereof, independent petroleum engineers with respect to the Company.

        (v)   Except as disclosed in the Registration Statement, the Time of Sale Information and the Prospectus (or any amendment or supplement thereto), (i) neither the Company nor any of its subsidiaries has incurred any material liabilities or obligations, indirect, direct or contingent, or entered into any transaction that is not in the ordinary course of business, (ii) neither the Company nor any of its subsidiaries has sustained any material loss or interference with its business or properties from fire, flood, windstorm, accident or other calamity, whether or not covered by insurance, (iii) the Company is not in default under the terms of any class of capital stock or membership interest of the Company or any outstanding debt obligations, (iv) there has not been any material change in the indebtedness of the Company (other than in the ordinary course of business) and (v) there has not been any material adverse change, or any development involving or that may reasonably be expected to result in a Material Adverse Effect, in the condition (financial or otherwise), business, properties, net worth or result of operations of the Company.

        (w)  Except as disclosed in the Registration Statement, the Time of Sale Information and the Prospectus (or any amendment or supplement thereto), the Trust has not sustained since the date of its formation any material loss or interference with respect to the Subject Interests from fire, explosion,

12

flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree; and, since the respective dates as of which information is given in the Registration Statement and the Prospectus (or any amendment or supplement thereto), there has not been (i) any change in the number of outstanding Trust Units or (ii) any material adverse change, or any development involving a prospective material adverse change, in or affecting the general affairs, financial position, or results of operations of the Trust, or management of the Subject Interests, otherwise than as set forth or contemplated in the Prospectus.

        (x)   The Units have been approved for listing on the NYSE under the symbol "MVO," subject to official notice of issuance of the Units being sold by the Company, and upon consummation of the offering contemplated hereby the Trust will be in compliance with the designation and maintenance criteria applicable to NYSE issuers.

        (y)   Other than excepted activity pursuant to Regulation M under the Exchange Act, the Company has not taken and will not take, directly or indirectly, any action that constituted, or any action designed to, or that might reasonably be expected to cause or result in or constitute, under the Act or otherwise, stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Units or for any other purpose.

        (z)   The Company and each of its subsidiaries have filed all tax returns required to be filed (other than certain state or local tax returns, as to which the failure to file, individually or in the aggregate, would not have a Material Adverse Effect), which returns are complete and correct, and neither the Company nor any subsidiary is in default in the payment of any taxes that were payable pursuant to said returns or any assessments with respect thereto. Except as disclosed in the Time of Sale Information and the Prospectus, all deficiencies asserted as a result of any federal, state, local or foreign tax audits have been paid or finally settled and no issue has been raised in any such audit that, by application of the same or similar principles, reasonably could be expected to result in a proposed deficiency for any other period not so audited. There are no outstanding agreements or waivers extending the statutory period of limitation applicable to any federal, state, local or foreign tax return for any period. On the Closing Date, all stock transfer and other taxes that are required to be paid in connection with the sale of the Firm Units to be sold by the Company to the Underwriters will have been fully paid by the Company and all laws imposing such taxes will have been complied with.

        (aa) Except as set forth in the Time of Sale Information and the Prospectus, there are no transactions with "affiliates" (as defined in Rule 405 promulgated under the Act) or any officer, director or security holder of the Company (whether or not an affiliate) that are required by the Act to be disclosed in the Registration Statement. Additionally, no relationship, direct or indirect, exists between the Company or any of its subsidiaries on the one hand, and the directors, officers, stockholders, customers or suppliers of the Company or any subsidiary on the other hand that is required by the Act to be disclosed in the Registration Statement, the Time of Sale Information and the Prospectus that is not so disclosed.

        (bb) The Company is not an "investment company" or an "affiliated person" of, or "promoter" or "principal underwriter" for, an investment company within the meaning of the Investment Company Act of 1940, as amended.

        (cc) The Company has and, as of Closing Date and the Additional Closing Date, as the case may be, will have good and defensible title to the Subject Interests, free and clear of all liens, encumbrances and defects except (i) those described in the Prospectus or the Time of Sale Information; (ii) royalties and other burdens and obligations, expressed and implied, under oil and gas leases; (iii) overriding royalties, production payments and similar interests and other burdens created by the Company or its predecessors in title; (iv) contractual obligations arising under operating agreements, farm out agreements and other agreements that may affect the properties or their titles of a type and nature customary in the oil and gas industry; (v) liens that arise in the normal course of operations, such as

13

those for unpaid taxes, statutory liens securing unpaid suppliers and contractors and contractual liens under operating agreements to secure payments of all amounts that are not yet delinquent or, if delinquent are being contested in good faith by appropriate proceedings; (vi) pooling, unitization and communalization agreements, declarations and orders; (vii) easements, restrictions, rights-of-way and other matters that commonly affect property; (viii) conventional rights of reassignment that obligate the Company to reassign all or part of any Subject Interest to a third party if the Company intends to release or abandon each interest before the termination of such interest; and (ix) rights reserved to or vested in appropriate governmental agencies or authorities to control or regulate the Subject Interests and the Term Net Profits Interest therein; none of which in the aggregate materially adversely affect the value of the Subject Interests and do not materially interfere with the Term Net Profits Interest or the use made and proposed to be made of such property by the Company and its subsidiaries. All contracts, agreements or underlying leases, which comprise a portion of the Subject Interests and which individually or in the aggregate are material to the Subject Interests taken as a whole, are in full force and effect, the Company has paid all rents and other charges to the extent due and payable thereunder, is not in default under any of such underlying contracts, agreements or leases, has received no notice of default from any other party thereto and knows of no material default by any other party thereto. The working interests in oil, gas and mineral leases or mineral interests that constitute a portion of the Subject Interests held by the Company reflect in all material respects the right of the Company to explore or receive production from such Subject Interests and the care taken by the Company and its subsidiaries with respect to acquiring or otherwise procuring such leases or mineral interests was generally consistent with standard industry practices for acquiring or procuring leases and interests therein to explore such for hydrocarbons. Upon recordation and filing of the Conveyance, the Trust will have good and defensible title to the Term Net Profits Interest, free and clear of all liens, encumbrances and defects, except Permitted Encumbrances (as defined in the Conveyance).

        (dd) As of the Closing Date and the Additional Closing Date, as the case may be, except for liens and encumbrances described in the first sentence of paragraph (cc) above, any and all liens or encumbrances on the Subject Interests will be subordinated to the Term Net Profits Interest and all future liens or encumbrances on the Subject Interests shall be subordinate and inferior to the Term Net Profits Interest.

        (ee) Since the date the Trust was formed through the date hereof, and except as may otherwise be disclosed in the Prospectus or Time of Sale Information, the Trust has not (i) issued or granted any Trust Units, (ii) incurred any liability or obligation, direct or contingent, (iii) entered into any transaction not in the ordinary course of business or (iv) made any distribution.

        (ff)  Each of the Company and its subsidiaries has all permits, licenses, franchises, approvals, consents and authorizations of governmental or regulatory authorities (hereinafter, "permit" or "permits") as are necessary to own its properties and to conduct its business in the manner described in the Time of Sale Information and the Prospectus, subject to such qualifications as may be set forth in the Time of Sale Information and the Prospectus, except where the failure to have obtained any such permit has not had and will not have a Material Adverse Effect; each of the Company and its subsidiaries has operated and is operating its business in material compliance with and not in material violation of all of its obligations with respect to each such permit and no event has occurred that allows, or after notice or lapse of time would allow, revocation or termination of any such permit or result in any other material impairment of the rights of any such permit, subject in each case to such qualification as may be set forth in the Time of Sale Information and the Prospectus; and, except as described in the Time of Sale Information and the Prospectus, such permits contain no restrictions that are materially burdensome to the Company or any of its subsidiaries.

        (gg) The Company and its subsidiaries maintain a system of internal accounting controls sufficient to provide reasonable assurances that (i) transactions are executed in accordance with management's general or specific authorizations, (ii) transactions are recorded as necessary to permit preparation of

14

financial statements in conformity with generally accepted accounting principles and to maintain accountability for assets, (iii) access to assets is permitted only in accordance with management's general or specific authorizations and (iv) the recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences.

        (hh) Neither the Company nor any of its subsidiaries, since each has been a subsidiary of the Company, nor, to the Company's knowledge, any employee or agent of the Company or any of its subsidiaries, has, directly or indirectly, (i) made any unlawful contribution to any candidate for political office, or failed to disclose fully any contribution in violation of law or (ii) made any payment to any federal, state, local or foreign governmental official, or other person charged with similar public or quasi-public duties, other than payments required or permitted by the laws of the United States or any jurisdiction thereof or applicable foreign jurisdictions.

        (ii)   The Company and its subsidiaries are (i) in compliance with any and all applicable federal, state, local and foreign laws and regulations relating to the protection of human health and safety, the environment or hazardous or toxic substances or wastes, pollutants or contaminants ("Environmental Laws"), (ii) have received all permits, licenses or other approvals required of them under applicable Environmental Laws to conduct their respective businesses and (iii) are in compliance with all terms and conditions of any such permit, license or approval, except where such noncompliance with Environmental Laws, failure to receive required permits, licenses or other approvals or failure to comply with the terms and conditions of such permits, licenses or other approvals would not, individually or in the aggregate, have a Material Adverse Effect or a material adverse effect on the Subject Interests. Neither the Company nor any of its subsidiaries has been named as a "potentially responsible party" under the Comprehensive Environmental Response Compensation and Liability Act of 1980, as amended. Neither the Company nor any of its subsidiaries owns, leases or occupies any property that appears on any list of hazardous sites compiled by any state or local governmental agency.

        (jj)   Each of the Company and its subsidiaries owns and has full right, title and interest in and to, or has valid licenses to use, each material trade name, trademark, service mark, patent, copyright, approval, trade secret and other similar rights (collectively "Intellectual Property") under which the Company and its subsidiaries conduct all or any material part of its business, and the Company has not created any lien or encumbrance on, or granted any right or license with respect to, any such Intellectual Property except where the failure to own or obtain a license or right to use any such Intellectual Property has not and will not have a Material Adverse Effect; there is no claim pending against the Company or its subsidiaries with respect to any Intellectual Property and the Company and its subsidiaries have not received notice or otherwise become aware that any Intellectual Property that it uses or has used in the conduct of its business infringes upon or conflicts with the rights of any third party. Neither the Company nor any of its subsidiaries has become aware that any material Intellectual Property that it uses or has used in the conduct of its business infringes upon or conflicts with the rights of any third party.

        (kk) The Company has procured Lock-Up Agreements, in the form of Exhibit A attached hereto, from each of the Selling Unitholders.

        (ll)   No officer, director or nominee for director or member of the Company has a direct or indirect affiliation or association with any member of the NASD.

        (mm) The Company and each of its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which it is engaged; and neither the Company nor any of its subsidiaries has reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a comparable cost.

15

        (nn) In the ordinary course of its business, the Company conducts a periodic review of the effect of Environmental Laws on the business, operations and properties of the Company and its subsidiaries, in the course of which it identifies and evaluates associated costs and liabilities (including any capital or operating expenditures required for clean-up, closure of properties or compliance with Environmental Laws or any permit, license or approval, any related constraints on operating activities and any potential liabilities to third parties). On the basis of such review and amount of its established reserves, the Company has reasonably concluded that such associated costs and liabilities would not, individually or in the aggregate, result in a Material Adverse Effect or a material adverse effect on the Subject Interests.

        (oo) The statements, (including the assumptions described therein) included in the Registration Statement, the Time of Sale Information and the Prospectus under the headings "Prospectus Summary," "Risk Factors," "Projected Cash Distributions" and "The Underlying Properties" (i) are within the coverage of Rule 175(b) under the Act to the extent such data constitute forward looking statements as defined in Rule 175(c) and (ii) were made by the Company with a reasonable basis and reflect the Company's good faith estimate of the matters described therein.

        (pp) The statements set forth in the Prospectus under the caption "Description of the Trust Units," insofar as they purport to constitute a summary of the terms of the Trust Units, and the statements under the captions "The Trust," "Computation of Net Proceeds," "Description of the Trust Agreement," "Description of the Trust Units," "Federal Income Tax Consequences," "State Tax Considerations," "ERISA Considerations" and "Underwriting," fairly and accurately describe the provisions of the laws and documents referred to therein in all material respects.

        (qq) The Trustee is a national banking association duly authorized and empowered to act as trustee of the Trust pursuant to the Organizational Trust Agreement and the Trust Agreement.

        (rr)  The Delaware Trustee is a Delaware banking corporation duly authorized and empowered to act as Delaware trustee of the Trust pursuant to the Organizational Trust Agreement and the Trust Agreement.

        (ss)  No consent, approval, authorization or filing is required under any law, rule or regulation of the States of Kansas or Colorado, or of the United States of America in order to permit the Trustee to act as Trustee of the Trust.

        6.2   Of the Selling Unitholders. Each Selling Unitholder hereby represents and warrants, severally as to itself and not jointly, to each Underwriter on the date hereof, and shall be deemed to represent and warrant to each Underwriter on the Closing Date and the Additional Closing Date, as the case may be, that:

        (a)   Such Selling Unitholder is the lawful owner of the Additional Units to be sold by such Selling Unitholder pursuant to this Agreement and has, and on the Closing Date and the Additional Closing Date, as the case may be, will have, good and valid title to such Additional Units, free of all restrictions on transfer, liens, encumbrances, security interests, equities and claims whatsoever, and such Selling Unitholder has full corporate power and authority to sell, assign, transfer and deliver such Trust Units hereunder; and, upon the delivery of such Trust Units and payment therefor pursuant hereto, good and valid title to such Trust Units, free and clear of all liens, encumbrances, equities or claims, will pass to the several Underwriters.

        (b)   Such Selling Unitholder has, and on the Closing Date and the Additional Closing Date, as the case may be, will have, full legal right, power and authority, and all authorization and approval required by law, to enter into (i) this Agreement, (ii) the Custody Agreement signed by such Selling Unitholder and [                        ], as custodian (the "Custodian"), relating to the deposit of the Additional Units to be sold by such Selling Unitholder (the "Custody Agreement") and (iii) the Power of Attorney appointing certain individuals named therein as such Selling Unitholder's attorneys-in-fact

16

(the "Attorneys") to the extent set forth therein relating to the transactions contemplated hereby and by the Prospectus (the "Power of Attorney") to sell, assign, transfer and deliver the Additional Units to be sold by such Selling Unitholder in the manner provided herein.

        (c)   Each of this Agreement, the Custody Agreement and Power of Attorney of such Selling Unitholder has been duly authorized, executed and delivered by such Selling Unitholder and is a valid and binding agreement of such Selling Unitholder, enforceable as to such Selling Unitholder in accordance with its terms, except to the extent enforceability may be limited by (i) the application of bankruptcy, reorganization, insolvency and other laws affecting creditors' rights generally and (ii) equitable principles being applied at the discretion of a court before which a proceeding may be brought, except as rights to indemnity and contribution hereunder may be limited by federal or state securities laws and, pursuant to such Power of Attorney, such Selling Unitholder has, among other things, authorized the Attorneys, or any one of them, to execute and deliver on such Selling Unitholder's behalf this Agreement and any other document that they, or any one of them, may deem necessary or desirable in connection with the transactions contemplated hereby and thereby and to deliver the Additional Units to be sold by such Selling Unitholder pursuant to this Agreement.

        (d)   None of the sale of the Additional Units by such Selling Unitholder, the execution, delivery or performance by such Selling Unitholder of this Agreement, the Custody Agreement and Power of Attorney of such Selling Unitholder by or on behalf of such Selling Unitholder, the compliance by such Selling Unitholder with all the provisions hereof and thereof nor the consummation by such Selling Unitholder of the transactions contemplated hereby and thereby (i) requires any consent, approval, authorization or other order of, or registration or filing with, any court, regulatory body or administrative agency or other governmental body, agency or official (except such as may be required under the securities or Blue Sky laws of the various states), (ii) conflicts with or will conflict with or constitutes or will constitute a breach of or a default under, the organizational documents of such Selling Unitholder, if such Selling Unitholder is not an individual, or any agreement, indenture, lease or other instrument to which such Selling Unitholder is a party or by which such Selling Unitholder or any property of such Selling Unitholder is bound or (iii) violates any statute, law, regulation, ruling, filing, judgment, injunction, order or decree applicable to such Selling Unitholder or any property of such Selling Unitholder.

        (e)   The information in the Prospectus under the caption "Selling Trust Unitholders" that specifically relates to such Selling Unitholder does not, and will not on the Closing Date or the Additional Closing Date, as the case may be, contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

        (f)    At any time prior to the Closing Date or the Additional Closing Date, as the case may be, if there is any change in the information referred to in Section 6.2(e) hereof, such Selling Unitholder will immediately notify the Representative of such change.

        (g)   Other than excepted activity pursuant to Regulation M under the Exchange Act, such Selling Unitholder has not taken and will not take, directly or indirectly, any action that constituted, or any action designed to, or that might reasonably be expected to cause or result in or constitute, under the Act or otherwise, stabilization or manipulation of the price of the Trust Units to facilitate the sale or resale of the Units.

        (h)   Upon delivery of and payment for the Additional Units to be sold by such Selling Unitholder pursuant to this Agreement, good and valid title to such Additional Units will pass to the Underwriters, free of all restrictions on transfer, liens, encumbrances, security interests, equities and claims whatsoever.

17

        (i)    Except as described in the Time of Sale Information and the Prospectus, such Selling Unitholder does not have any registration or other similar rights to have any equity or debt securities registered for sale by the Company under the Registration Statement or included in the offering contemplated by this Agreement.

        (j)    Such Selling Unitholder has no reason to believe that the representations and warranties of the Company contained in Section 6.1 hereof are not true and correct, is familiar with the Registration Statement and the Prospectus and has no knowledge of any material fact, condition or information not disclosed in the Registration Statement or the Prospectus that has had or may have a Material Adverse Effect, and is not prompted to sell Trust Units by any information concerning the Company that is not set forth in the Registration Statement.

        7.     Expenses. Whether or not the transactions contemplated hereby are consummated or this Agreement becomes effective or is terminated, the Company and Selling Unitholders, jointly and severally, agree to pay or cause to be paid the following: (i) the fees, disbursements and expenses of the Company's counsel and accountants in connection with the registration of the Units under the Act and all other expenses in connection with the preparation, printing and filing of the Registration Statement and the Prospectus and amendments and supplements thereto and the mailing and delivering of copies thereof and of any Preliminary Prospectus to the Underwriters and dealers; (ii) the printing and delivery (including postage, air freight charges and charges for counting and packaging) of such copies of the Registration Statement, the Prospectus, each Preliminary Prospectus, the Time of Sale Information, the Blue Sky memoranda, the Master Agreement Among Underwriters, this Agreement, the Selected Dealers Agreement and all amendments or supplements to any of them as may be reasonably requested for use in connection with the offering and sale of the Units; (iii) consistent with the provisions of Section 5.1(i), all expenses in connection with the qualification of the Units for offering and sale under state securities laws or Blue Sky laws, including reasonable attorneys' fees and out-of-pocket expenses of the counsel for the Underwriters in connection therewith; (iv) the filing fees incident to securing any required review by the NASD of the fairness of the terms of the sale of the Units and the reasonable fees and disbursements of the Underwriters' counsel relating thereto; (v) the fees and expenses associated with listing the Units on the NYSE; (vi) the cost of preparing unit certificates; (vii) the costs and charges of any transfer agent or registrar; (viii) the cost of the tax stamps, if any, in connection with the issuance and delivery of the Units to the respective Underwriters; (ix) all other fees, costs and expenses referred to in Item 13 of the Registration Statement; and (x) the transportation, lodging, graphics and other expenses incidental to the Company's preparation for and participation in the "roadshow" for the offering contemplated hereby. Except as provided in this Section 7 and in Section 8 hereof, the Underwriters shall pay their own expenses, including the fees and disbursements of their counsel. In addition, in the event that the proposed offering is terminated for the reasons set forth in Section 5.1(j) hereof, the Company agrees to reimburse the Underwriters as provided in Section 5.1(j).

        8.     Indemnification and Contribution. Subject to the limitations in this paragraph below, the Company agrees to indemnify and hold harmless you and each other Underwriter, the directors, officers, employees and agents of each Underwriter, and each person, if any, who controls any Underwriter within the meaning of Section 15 of the Act or Section 20 of the Exchange Act from and against any and all losses, claims, damages, liabilities and expenses, including reasonable costs of investigation and attorneys' fees and expenses (collectively, "Damages") arising out of or based upon (i) any untrue statement or alleged untrue statement of a material fact contained in any Preliminary Prospectus, in the Registration Statement, the Time of Sale Information, any Issuer Free Writing Prospectus or the Prospectus or in any amendment or supplement thereto, or any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in light of the circumstances under which they were made) not misleading, except to the extent that any such Damages arise out of or are based upon an

18

untrue statement or omission or alleged untrue statement or omission that has been made therein or omitted therefrom in reliance upon and in conformity with the information furnished in writing to the Company by or on behalf of any Underwriter through you, or by or on behalf of the Selling Unitholders, as the case may be, expressly for use in connection therewith or (ii) any inaccuracy in or breach of the representations and warranties of the Company contained herein or any failure of the Company to perform its obligations hereunder or under law; provided, however, that with respect to any untrue statement or omission made in any Preliminary Prospectus, the indemnity agreement contained in this paragraph shall not inure to the benefit of any Underwriter (or to the benefit of any person controlling such Underwriter or to any officer, director, employee or agent of any Underwriter) from whom the person asserting any such Damages purchased the Units concerned if both (A) a copy of the Time of Sale Information was not sent or given to such person at or prior to the written confirmation of the sale of such Units to such person as required by the Act and (B) the untrue statement or omission in the Preliminary Prospectus was corrected in the Time of Sale Information. This indemnification shall be in addition to any liability that the Company may otherwise have.

        Subject to the limitations in this paragraph below, each Selling Unitholder, severally and not jointly, agrees to indemnify and hold harmless you and each other Underwriter, the directors, officers, employees and agents of each Underwriter, and each person, if any, who controls any Underwriter within the meaning of Section 15 of the Act or Section 20 of the Exchange Act from and against any and all Damages arising out of or based upon (i) any untrue statement or alleged untrue statement of a material fact contained in any Preliminary Prospectus or in the Registration Statement, the Time of Sale Information, any free writing prospectus or the Prospectus or in any amendment or supplement thereto, or any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in light of the circumstances under which they were made) not misleading, except to the extent that any such Damages arise out of or are based upon an untrue statement or omission or alleged untrue statement or omission that has been made therein or omitted therefrom in reliance upon and in conformity with the information not expressly relating to the Selling Unitholder or the offering by them of their Additional Units or furnished in writing to the Company by or on behalf of any Underwriter through you expressly for use in connection therewith or (ii) any inaccuracy in or breach of the representations and warranties of such Selling Stockholder contained herein or any failure of such Selling Stockholder to perform its obligations hereunder or under law; provided, however, that with respect to any untrue statement or omission made in any Preliminary Prospectus, the indemnity agreement contained in this paragraph shall not inure to the benefit of any Underwriter (or to the benefit of any person controlling such Underwriter or to any officer, director, employee or agent of any Underwriter) from whom the person asserting any such Damages purchased the Additional Units concerned if both (A) a copy of the Time of Sale Information was not sent or given to such person at or prior to the written confirmation of the sale of such Additional Units to such person as required by the Act and (B) the untrue statement or omission in the Preliminary Prospectus was corrected in the Time of Sale Information. This indemnification shall be in addition to any liability that the Selling Unitsholder or any Selling Unitholders may otherwise have.

        In addition to its their other obligations under this Section 8, each of the Company and the Selling Unitholders, severally and not jointly, agrees that, as an interim measure during the pendency of any claim, action, investigation, inquiry or other proceeding arising out of or based upon any statement or omission, or any inaccuracy in the representations and warranties of the Company or the Selling Stockholders herein or failure to perform its their respective obligations hereunder, all as set forth in this Section 8, the party against whom indemnification is being sought will reimburse each Underwriter on a monthly basis for all reasonable legal or other out-of-pocket expenses incurred in connection with investigating or defending any such claim, action, investigation, inquiry or other proceeding (to the extent documented by reasonably itemized invoices therefor), notwithstanding the absence of a judicial determination as to the propriety and enforceability of the obligation of the Company or a Selling

19

Stockholder to reimburse each Underwriter for such expenses and the possibility that such payments might later be held to have been improper by a court of competent jurisdiction. To the extent that any such interim reimbursement payment is so held to have been improper, each Underwriter shall promptly return it to the person(s) from whom it was received. Any such interim reimbursement payments that are not made to the Underwriters within 30 days of a request for reimbursement shall bear interest compounded daily at a rate determined on the basis of the base lending rate announced from time to time by The Wall Street Journal from the date of such request.

        If any action or claim shall be brought against any Underwriter or any person controlling any Underwriter in respect of which indemnity may be sought jointly and severally against the Company and the Selling Unitholders, such Underwriter or such controlling person shall promptly notify in writing the party(s) against whom indemnification is being sought (the "indemnifying party" or "indemnifying parties"), and such indemnifying party(s) shall assume the defense thereof, including the employment of counsel reasonably acceptable to such Underwriter or such controlling person and the payment of all reasonable fees of and expenses incurred by such counsel. Such Underwriter or any such controlling person shall have the right to employ separate counsel in any such action and participate in the defense thereof, but the fees and expenses of such counsel shall be at the expense of such Underwriter or such controlling person, unless (i) the indemnifying party(s) has (have) agreed in writing to pay such fees and expenses, (ii) the indemnifying party(s) has (have) failed to assume the defense and employ counsel reasonably acceptable to the Underwriter or such controlling person or (iii) the named parties to any such action (including any impleaded parties) include both such Underwriter or such controlling person and the indemnifying party(s), and such Underwriter or such controlling person shall have been advised by its counsel that one or more legal defenses may be available to the Underwriter that may not be available to the Company or the Selling Unitholders, or that representation of such indemnified party and any indemnifying party(s) by the same counsel would be inappropriate under applicable standards of professional conduct (whether or not such representation by the same counsel has been proposed) due to actual or potential differing interests between them (in which case the indemnifying party(s) shall not have the right to assume the defense of such action on behalf of such Underwriter or such controlling person (but the Company and the Selling Unitholders, as applicable, shall not be liable for the fees and expenses of more than one counsel for the Underwriters and such controlling persons)). The indemnifying party(s) shall not be liable for any settlement of any such action effected without its (their several) written consent, but if settled with such written consent, or if there be a final judgment for the plaintiff in any such action, the indemnifying party(s) agree(s) to indemnify and hold harmless any Underwriter and any such controlling person from and against any loss, claim, damage, liability or expense by reason of such settlement or judgment, but in the case of a judgment only to the extent stated in the first and second paragraph of this Section 8.

        Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company and the Selling Unitholders, their respective directors, their respective officers who sign the Registration Statement and any person who controls the Company or the Selling Stockholders within the meaning of Section 15 of the Act or Section 20 of the Exchange Act, to the same extent as the foregoing several indemnity from the Company and the Selling Unitholders to each Underwriter, but only with respect to information furnished in writing by or on behalf of such Underwriter through you expressly for use in the Registration Statement, the Prospectus, the Time of Sale Information, any Issuer Free Writing Prospectus or any Preliminary Prospectus, or any amendment or supplement thereto. If any action or claim shall be brought or asserted against the Company or the Selling Unitholders, any of their respective directors, any of their respective officers or any such controlling person based on the Registration Statement, the Prospectus, the Time of Sale Information or any Preliminary Prospectus, or any amendment or supplement thereto, and in respect of which indemnity may be sought against any Underwriter pursuant to this paragraph, such Underwriter shall have the rights and duties given to the Company and the Selling Stockholders by the immediately preceding

20

paragraph (except that if the Company and the Selling Unitholders shall have assumed the defense thereof such Underwriter shall not be required to do so, but may employ separate counsel therein and participate in the defense thereof, but the fees and expenses of such counsel shall be at such Underwriter's expense), and the Company and the Selling Unitholders, their respective directors, any such officers and any such controlling persons, shall have the rights and duties given to the Underwriters by the immediately preceding paragraph.

        In any event, the Company or the Selling Unitholders will not, without the prior written consent of the Representative, settle or compromise or consent to the entry of any judgment in any proceeding or threatened claim, action, suit or proceeding in respect of which the indemnification may be sought hereunder (whether or not the Representative or any person who controls the Representative within the meaning of Section 15 of the Act or Section 20 of the Exchange Act is a party to such claim, action, suit or proceeding) unless such settlement, compromise or consent includes an unconditional release of all Underwriters and such controlling persons from all liability arising out of such claim, action, suit or proceeding.

        If the indemnification provided for in this Section 8 is unavailable or insufficient for any reason whatsoever to an indemnified party in respect of any Damages referred to herein, then an indemnifying party, in lieu of indemnifying such indemnified party, shall contribute to the amount paid or payable by such indemnified party as a result of such Damages (i) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Selling Unitholders, respectively, on the one hand, and the Underwriters on the other hand, from the offering and sale of the Units or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative and several fault of the Company and the Selling Unitholders, respectively, on the one hand, and the Underwriters on the other hand, in connection with the statements or omissions that resulted in such Damages as well as any other relevant equitable considerations. The relative and several benefits received by the Company and the Selling Unitholders, respectively, on the one hand, and the Underwriters on the other hand, shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Company and the Selling Unitholders bear to the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover page of the Prospectus; provided that, in the event that the Underwriters shall have purchased any Additional Units hereunder, any determination of the relative benefits received by the Company and the Selling Unitholders or the Underwriters from the offering of the Units shall include the net proceeds (before deducting expenses) received by the Company and the Selling Unitholders, and the underwriting discounts and commissions received by the Underwriters, from the sale of such Additional Units, in each case computed on the basis of the respective amounts set forth in the notes to the table on the cover page of the Prospectus. The relative fault of the Company and the Selling Unitholders, respectively, on the one hand, and the Underwriters on the other hand, shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or the Selling Unitholders, on the one hand, or by the Underwriters on the other hand and the parties' relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

        The Company, the Selling Unitholders and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section 8 was determined by a pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take into account the equitable considerations referred to in the immediately preceding paragraph. The amount paid or payable by an indemnified party as a result of the Damages referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such indemnified party in connection with

21

investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8, no Underwriter shall be required to contribute any amount in excess of the amount of the underwriting commissions received by such underwriter in connection with the Units underwritten by it and distributed to the public. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters' obligations to contribute pursuant to this Section 8 are several in proportion to the respective numbers of Firm Units set forth opposite their names in Schedule I hereto (or such numbers of Firm Units increased as set forth in Section 10 hereof) and not joint.

        Notwithstanding the third paragraph of this Section 8, any Damages for which an indemnified party is entitled to indemnification or contribution under this Section 8 shall be paid by the indemnifying party to the indemnified party as Damages are incurred after receipt of reasonably itemized invoices therefor. The indemnity, contribution and reimbursement agreements contained in this Section 8 and the several, and not joint, representations and warranties of the Company and the Selling Unitholders set forth in this Agreement shall remain operative and in full force and effect, regardless of (i) any investigation made by or on behalf of any Underwriter or any person controlling any Underwriter, the Company, the Selling Unitholders, their respective directors or officers or any person controlling the Company or the Selling Unitholders, (ii) acceptance of any Units and payment therefor hereunder and (iii) any termination of this Agreement. A successor to any Underwriter or any person controlling any Underwriter, or to the Company or the Selling Unitholders, their respective directors or officers or any person controlling the Company or the Selling Unitholders, shall be entitled to the benefits of the indemnity, contribution and reimbursement agreements contained in this Section 8.

        It is agreed that any controversy arising out of the operation of the interim reimbursement arrangements set forth in the third paragraph of this Section 8, including the amounts of any requested reimbursement payments and the method of determining such amounts, shall be settled by arbitration conducted pursuant to the Code of Arbitration Procedure of the NASD. Any such arbitration must be commenced by service of a written demand for arbitration or written notice of intention to arbitrate, therein electing the arbitration tribunal. In the event the party demanding arbitration does not make such designation of an arbitration tribunal in such demand or notice, then the party responding to said demand or notice is authorized to do so. Such arbitration would be limited to the operation of the interim reimbursement provisions contained in the third and fifth paragraphs of this Section 8, and would not resolve the ultimate propriety or enforceability of the obligation to reimburse expenses that is created by the provisions of the third paragraph of this Section 8.

        9.     Conditions of Underwriters' Obligations. The several obligations of the Underwriters to purchase the Firm Units hereunder are subject to the following conditions:

        (a)   The Registration Statement shall have become effective not later than 12:00 noon, New York City time, on the date hereof, or at such later date and time as shall be consented to in writing by the Representative, and all filings required by Rules 424(b), 430A and 462 under the Act shall have been timely made.

        (b)   All corporate proceedings and other legal matters incident to the authorization, form and validity of this Agreement, the Organizational Trust Agreement, the Trust Agreement, the Administrative Services Agreement, the Conveyance, the Registration Statement and the Prospectus, and all other legal matters relating to this Agreement and the transactions contemplated hereby shall be reasonably satisfactory in all material respects to counsel for the Underwriters, and the Company shall have furnished to such counsel all documents and information that they may reasonably request to enable them to pass upon such matters.

22

        (c)   You shall be reasonably satisfied that since the respective dates as of which information is given in the Registration Statement, the Time of Sale Information and Prospectus, (i) there shall not have been any change in the capital stock or membership interests of the Company or any material change in the indebtedness (other than in the ordinary course of business) of the Company or the Trust, (ii) except as set forth or contemplated by the Registration Statement, the Time of Sale Information or the Prospectus, no material oral or written agreement or other transaction shall have been entered into by the Company that is not in the ordinary course of business or that could reasonably be expected to result in a material reduction in the future earnings of the Company, (iii) no loss or damage (whether or not insured) to the property of the Company shall have been sustained that had or could reasonably be expected to have a Material Adverse Effect or have a material adverse effect on the Subject Interests, (iv) no legal or governmental action, suit or proceeding affecting the Company or any of its properties that is material to the Company or that affects or could reasonably be expected to affect the transactions contemplated by this Agreement shall have been instituted or threatened and (v) there shall not have been any material change in the condition (financial or otherwise), business, management, results of operations or prospects of the Company or its subsidiaries that makes it impractical or inadvisable in your judgment to proceed with the public offering or purchase of the Units as contemplated hereby.

        (d)   You shall have received on the Closing Date (and the Additional Closing Date, if any) an opinion of [Vinson & Elkins L.L.P.] [To be discussed—Allocation of opinion topics among V&E and local counsel.], counsel to the Company, substantially to the effect that:

        (i)    The Trust is a statutory trust duly organized and validly existing in good standing under the laws of the State of Delaware, with full trust power and authority to own, lease and operate its properties and to conduct its business as described in the Registration Statement and the Prospectus (and any amendment or supplement thereto). The Trust Units have been duly authorized, are fully paid without the requirement of any further consideration, and, assuming due execution by the Trustee of the certificates representing the Trust Units, are validly issued and entitle the holder thereof to the benefits of the Trust Agreement.

        (ii)   No consent, approval, authorization or other order of, or registration or filing with, any court, regulatory body, administrative agency or other governmental body, agency or official is required on the part of the Company (except such as have been obtained under the Act or such as may be required under state securities or Blue Sky laws governing the purchase and distribution of the Firm Units by the Underwriters) for the valid sale of the Units to the Underwriters under this Agreement, the execution, delivery and performance of this Agreement, the Organizational Trust Agreement, the Trust Agreement or the Administrative Services Agreement or the consummation of the transactions contemplated hereby and thereby.

        (iii)  No consent, approval, authorization or other order of, or registration or filing with, any court, regulatory body, administrative agency or other governmental body, agency or official is required on the part of the Selling Unitholders (except such as have been obtained under the Act or such as may be required under state securities or Blue Sky laws governing the purchase and distribution of the Additional Units) for the valid sale of the Additional Units to the Underwriters by the Selling Unitholders under this Agreement.

        (iv)  The Company has all requisite power and authority to enter into this Agreement, the Organizational Trust Agreement, the Trust Agreement and the Administrative Services Agreement and to sell and deliver the Firm Units to be sold by it to the Underwriters as provided herein. Each of this Agreement, the Organizational Trust Agreement, the Trust Agreement and the Administrative Services Agreement has been duly authorized, executed and delivered by the Company. Each of the Organizational Trust Agreement, the Trust Agreement and the Administrative Services Agreement is a valid and binding agreement of the Company, enforceable

23

against the Company in accordance with its terms, except as to the extent enforceability may be limited by (A) the application of bankruptcy, reorganization, insolvency or other laws affecting creditors' rights generally and (B) equitable principles being applied at the discretion of a court before which any proceeding may be brought, and except as rights to indemnity and contribution hereunder may be limited by federal or state securities laws.

        (v)   The Selling Unitholders have all requisite power and authority to enter into this Agreement and to sell and deliver the Additional Units to be sold by them to the Underwriters as provided herein. Each of this Agreement, the Custody Agreement and the Powers of Attorney of the Selling Unitholders has been duly authorized, executed and delivered by, and is a valid and binding agreement of, the Selling Unitholders enforceable against the Selling Unitholders in accordance with its terms, except to the extent enforceability may be limited by (A) bankruptcy, reorganization, insolvency or other laws affecting enforcement of creditors' rights generally and (B) equitable principles being applied at the discretion of a court before which any proceeding may be brought, and except as to indemnity and contribution hereunder may be limited by federal or state securities laws.

        (vi)  The Company is the record owner of the Firm Units to be sold by the Company to the Underwriters hereunder, and the Company has corporate power and authority to sell and deliver to the Underwriters such Firm Units; such counsel has no knowledge that, immediately prior to the Closing Date, the Company did not have good and valid title to such Firm Units sold at the Closing Date, free and clear of all adverse claims (within the meaning of Article 8 of the Uniform Commercial Code ("UCC")). Upon payment for the Firm Units to be sold by the Company, delivery of such Firm Units, as directed by the Underwriters, to Cede & Co. ("Cede") or such other nominee as may be designated by the DTC, registration of such Firm Units in the name of Cede or such other nominee and the crediting of such Firm Units on the books of DTC to "securities accounts" (within the meaning of Section 8-501 (a) of the UCC) of the Underwriters (assuming that neither DTC nor any such Underwriter has notice of any "adverse claim" (within the meaning of Section 8-105 of the UCC) to such Trust Units), (A) the Underwriters will acquire a valid "security entitlement" (within the meaning of Section 8-102(a)(17) of the UCC) in respect of such Firm Units and (ii) no action based on any "adverse claim" (within the meaning of Section 8-102(a)(1) of the UCC) to such Firm Units may be asserted against the Underwriters with respect to such "security entitlement".

        (vii) The Selling Unitholders are the record owner of the Additional Units to be sold by the Selling Unitholders to the Underwriters hereunder, and the Selling Unitholders have corporate power and authority to sell and deliver to the Underwriters such Additional Units; such counsel has no knowledge that immediately prior to the Additional Closing Date the Company did not have good and valid title to such Trust Units sold at the Additional Closing Date, free and clear of all adverse claims (within the meaning of Article 8 of the UCC). Upon payment for the Additional Units to be sold by the Selling Unitholders, delivery of such Additional Units, as directed by the Underwriters, to Cede or such other nominee as may be designated by the DTC, registration of such Additional Units in the name of Cede or such other nominee and the crediting of such Additional Units on the books of DTC to "securities accounts" (within the meaning of Section 8-501(a) of the UCC) of the Underwriters (assuming that neither DTC nor any such Underwriter has notice of any "adverse claim" (within the meaning of Section 8-105 of the UCC) to such Additional Units), (A) the Underwriters will acquire a valid "security entitlement" (within the meaning of Section 8-102(a)(17) of the UCC) in respect of such Additional Units and (B) no action based on any "adverse claim" (within the meaning of Section 8-102(a)(1) of the UCC) to such Additional Units may be asserted against the Underwriters with respect to such "security entitlement".

24

        (viii) The Company is a limited liability company organized and validly existing in good standing under the laws of the State of Kansas, with full corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Registration Statement and the Prospectus (and any amendment or supplement thereto), and is duly registered or otherwise qualified to conduct its business as a foreign corporation and is in good standing in the states of Kansas and Colorado.

        (ix)  Each of the Company's subsidiaries is a corporation duly organized and validly existing in good standing under the laws of the jurisdiction of its organization, with full corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Registration Statement and the Prospectus (and any amendment or supplement thereto), and is duly registered or otherwise qualified to conduct its business as a foreign corporation and is in good standing in the states of Kansas and Colorado; and all of the outstanding shares of capital stock or other equity interests of each of the subsidiaries have been duly authorized and validly issued, and are fully paid and nonassessable, and are owned by the Company directly, or indirectly through one of the other subsidiaries, free and clear of any perfected security interest, or any other security interest, lien, adverse claim, equity or other encumbrance.

        (x)   To the knowledge of such counsel after reasonable inquiry, neither the Company nor any of its subsidiaries is in violation of its certificate or articles of incorporation or organization or bylaws, or other organizational documents or agreements, and is not in default in the performance of any obligation, agreement or condition contained in any bond, indenture, note or other evidence of indebtedness or any other agreement or obligation of the Company (as identified by the Company to such counsel and listed in an exhibit to such opinion) where the default would have, individually or in the aggregate, a Material Adverse Effect.

        (xi)  Neither the offer, sale or delivery of the Firm Units by the Company, the execution, delivery or performance by the Company of this Agreement, the Organizational Trust Agreement, the Trust Agreement or the Administrative Services Agreement, compliance by the Company with all provisions hereof nor consummation by the Company of the transactions contemplated hereby (A) conflicts or will conflict with or constitutes or will constitute a breach of, or a default under, the articles of organization or operating agreement the Company or any material agreement, indenture, lease or other instrument to which the Company is a party or by which any of its properties is bound (as identified by the Company to such counsel and listed in an exhibit to such opinion) or (B) creates or will result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company or (C) violates or will result in any violation of any existing law, statute, regulation, ruling (assuming compliance with all applicable state securities and Blue Sky laws), judgment, injunction, order or decree that is known to such counsel and is applicable to the Company or any of its properties.

        (xii) Neither the offer, sale or delivery of the Additional Shares by the Selling Unitholders, the execution, delivery or performance by the Selling Unitholders of this Agreement, compliance by the Selling Unitholders with all provisions hereof nor consummation by the Selling Unitholders of the transactions contemplated hereby (A) conflicts or will conflict with or constitutes or will constitute a breach of, or a default under, the organizational documents of such Selling Unitholder, if such Selling Unitholder is not an individual, or any material agreement, indenture, lease or other instrument to which such Selling Unitholder is a party or by which any of their properties is bound, (B) creates or will result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of such Selling Unitholder or (C) violates or will result in any violation of any existing law, statute, regulation, ruling (assuming compliance with all applicable state and securities and Blue Sky laws), judgment, injunction, order or decree that is known to such counsel and is applicable to such Selling Unitholder or any of its properties.

25

        (xiii) The Conveyance has been duly authorized and when duly executed by the proper officers of the Company and delivered by the Company to the Trust, will constitute valid and binding agreements of the Company enforceable against the Company in accordance with its terms, except as such enforceability may be limited by (A) the application of bankruptcy, reorganization, insolvency or other laws affecting creditors' rights generally and (B) equitable principles being applied at the discretion of a court before which any proceeding may be brought; the form of the Conveyance to be filed is adequate and sufficient under the laws of each state in which it is to be filed to transfer title to the Term Net Profits Interest to the Trust and complies with the laws of such state relating to recording, filing and registration laws and regulations; the recording of the Conveyance in the appropriate real property records in each county in any state where the Subject Interests are located is sufficient to provide the Trust the protections afforded under the recordation laws of such state against purchasers or creditors of the Company and its subsidiaries subsequently acquiring interests in the Subject Interests, and such purchasers and creditors of the Company will be deemed to purchase with notice of, and subject to, such Term Net Profits Interest and the Conveyance and the related Term Net Profits Interest should not constitute executory contracts as such term is used in the federal bankruptcy code; the Company has made all necessary recordings and filings of the Conveyance; the Term Net Profits Interest and the Conveyance conform in all material respects to the descriptions thereof in the Prospectus.

        (xiv) Neither the Trust nor the Trustee is required to qualify to transact business or appoint an agent for service of process in the states in which the Conveyance is to be filed as a result of the ownership, operation or activities of the Trust or the Trustee with respect to the Trust, and the activities of the Trustee pursuant to the Trust Agreement will not require the appointment of an ancillary trustee in the states the Conveyance is to be filed.

        (xv) A beneficial owner of a Trust Unit will not be subject to personal liability under state and local laws in the states the Conveyance is to be filed by virtue of said ownership, including liability regulating the discharge of materials into the environment or otherwise relating to the protection of the environment.

        (xvi) The execution, delivery and performance by the Trustee of the Trust Agreement will not violate or conflict with any law, administrative ruling or regulation of the states in which the Conveyance is to be filed.

        (xvii) No consent, approval, authorization or filing is required under any law, rule or regulation of the states in which the Conveyance is to be filed (A) to permit the Trustee to act as trustee with respect to the oil and gas properties located in such states or (B) in connection with the execution and delivery of the Conveyance, or necessary to the validity, legality or enforceability of the Conveyance.

        (xviii) Except as described in the Time of Sale Information or the Prospectus, there is no action, suit, inquiry, proceeding, or investigation by or before any court or governmental or other regulatory or administrative agency or commission pending or, to the knowledge of such counsel, threatened, against or involving the Company or its subsidiaries, or the properties of either the Company or any of its subsidiaries: (A) which might individually or in the aggregate prevent or adversely affect the transactions contemplated by this Agreement or result in a Material Adverse Effect, nor, to the knowledge of such counsel, is there any basis for any such action, suit, inquiry, proceeding or investigation; or (B) that are required to be described in the Registration Statement or Prospectus (or any amendment or supplement thereto) that are not described as required therein.

        (xix) Such counsel has reviewed all agreements, contracts, indentures, leases or other documents or instruments described or referred to in the Registration Statement and the Prospectus, and such agreements, contracts (and forms of contracts), indentures, leases or other

26

documents or instruments are fairly summarized or disclosed in all material respects therein, and filed as exhibits thereto as required, and such counsel does not know of any agreements, contracts, indentures, leases or other documents or instruments required to be so summarized or disclosed or filed that have not been so summarized or disclosed or filed.

        (xx) The Registration Statement has been declared effective by the Commission under the Act. To the best knowledge of such counsel, no stop order suspending the effectiveness of the Registration Statement has been issued under the Act and no proceedings for such purpose have been instituted or are pending or are contemplated or threatened by the Commission. Any required filing of the Prospectus and any supplement thereto pursuant to Rule 424(b) under the Act has been made in the manner and within the time period required by such Rule 424(b).

        (xxi) The Registration Statement, including any Rule 462 Registration Statement, the Prospectus and each amendment or supplement to the Registration Statement and the Prospectus, as of their respective effective or issue dates (other than the financial statements and supporting schedules included therein or in exhibits to or excluded from the Registration Statement, as to which no opinion need be given) comply as to form in all material respects with the requirements of the Act.

        (xxii) The descriptions in the Prospectus of statutes, regulations or legal or governmental proceedings, insofar as they purport to summarize certain of the provisions thereof, are accurate in all material respects and fairly present the information required to be presented by the Act and the rules and regulations thereunder.

        (xxiii) The Company is not an "investment company" or an "affiliated person" of, or "promoter" or "principal investor" for, an "investment company," as such terms are defined in the Investment Company Act of 1940, as amended.

        (xxiv) The Units have been approved for listing on the New York Stock Exchange.

        (xxv) The statements (A) in the Time of Sale Information and the Prospectus under the captions "Risk Factors—The trust and the public trust unitholders will have no voting or managerial rights with respect to MV Partners, the operator of the underlying properties. As a result, public trust unitholders will have no ability to influence the operation of the underlying properties," "Risk Factors—MV Partners may transfer all or a portion of the underlying properties at any time, subject to specified limitations, and MV Partners may abandon individual wells or properties that it reasonably believes to be uneconomic. Under these circumstances, trust unitholders will have no ability to prevent MV Partners from transferring the underlying properties to another operator, even if the trust unitholders do not believe that operator would operate the underlying properties in the same manner as MV Partners," "Risk Factors—The amount of cash available for distribution by the trust will be reduced by the amount of any production and development costs, taxes, costs and payments made with respect to the hedge contracts, capital expenditures and post-production costs," "Risk Factors—The trustee may, under certain circumstances, sell the net profits interest and dissolve the trust prior to the expected termination of the trust. As a result, trust unitholders may not recover their investment," "Risk Factors—Conflicts of interest could arise between MV Partners and the trust unitholders," "Risk Factors—The trust is managed by a trustee who cannot be replaced except at a special meeting of trust unitholders," "Risk Factors—Trust unitholders have limited ability to enforce provisions of the net profits interest," "Risk Factors—Courts outside of Delaware may not recognize the limited liability of the trust unitholders provided under Delaware law," "Risk Factors—The trust has not obtained a ruling from the IRS regarding the tax treatment of ownership of the trust units. If the IRS were to determine that the trust is not a 'grantor trust' for federal income tax purposes, the trust unitholders may receive different and less advantageous tax treatment than that described in this prospectus," "The Trust," "Computation of Net Proceeds," "Description of the Trust Agreement,"

27

"Description of the Trust Units," "Federal Income Tax Considerations," "State Tax Considerations" and "ERISA Considerations" and (B) in Item 14 and Item 15 of the Registration Statement, insofar as such statements constitute matters of law, summaries of legal matters, the Company's articles of organization and operating agreement, documents or legal proceedings, or legal conclusions, have been reviewed by such counsel and are accurate descriptions in all material respects of the legal matters described therein.

        (xxvi) Assuming the purchase of the Additional Units by the Selling Unitholders as described in the Prospectus, the Additional Units are fungible, for federal income tax purposes, with the Firm Units.

        In rendering such opinion, counsel may rely, to the extent they deem such reliance proper, as to matters of fact upon certificates of officers of the Company and of government officials, provided that counsel shall state their belief that they and you are justified in relying thereon. Copies of all such certificates shall be furnished to you and your counsel on the Closing Date and the Additional Closing Date, as the case may be.

        In addition to the opinion set forth above, such counsel shall state that during the course of their participation in the preparation of the Registration Statement, the Prospectus and the Time of Sale Information, and any amendments thereto, nothing has come to the attention of such counsel that has caused them to believe or given them reason to believe that the Registration Statement, the Prospectus or the Time of Sale Information, or any amendment thereto (except for the financial statements and other financial and accounting information contained therein or omitted therefrom as to which no opinion need be expressed), at the date thereof, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading or that the Registration Statement, the Prospectus or the Time of Sale Information as of the date of the opinion (except as aforesaid), contains an untrue statement of a material fact or omits to state a material fact necessary to make the statements therein, in light of the circumstances under which they were made, not misleading.

        (e)   You shall have received on the Closing Date or Additional Closing Date, as the case may be, an opinion of Baker Botts L.L.P., as counsel for the Underwriters, dated the Closing Date or Additional Closing Date, as the case may be, with respect to the sale of the Units, the Registration Statement and other related matters as you may reasonably request, and the Company and its counsel shall have furnished to your counsel such documents as they may reasonably request for the purpose of enabling them to pass upon such matters.

        (f)    You shall have received on the Closing Date or Additional Closing Date, as the case may be, a certificate of the Trustee, dated the Closing Date or Additional Closing Date, as the case may be, executed by a duly authorized officer of the Trustee, representing and warranting to each of the Underwriters that:

        (i)    The Trustee is a national banking association authorized and empowered to act as trustee of the Trust pursuant to the Trust Agreement, and no consent, approval, authorization or filing is required under any law, rule or regulation of the State of Delaware or of the United States of America in order to permit the Trustee to act as trustee of the Trust;

        (ii)   The Trust Agreement has been executed and delivered by the Trustee and, assuming the due authorization, execution and delivery thereof by the Company, is a valid and binding obligation of the Trustee, enforceable against the Trustee in accordance with its terms, except as the enforceability thereof may be limited by (A) the application of bankruptcy, reorganization, insolvency or other laws affecting creditors' rights generally and (B) equitable principles being applied at the discretion of a court before which any proceeding may be brought; and the Conveyance has been duly and validly executed by the Trustee; and

28

        (iii)  There are 11,500,000 Trust Units authorized and outstanding under the Trust Agreement, all of which have been duly and validly issued in accordance with the Trust Agreement; to the extent certificates representing Trust Units have been issued, certificates representing the Trust Units have been duly executed by the Trustee; and holders of the Trust Units are entitled to the benefits of the Trust Agreement.

        (g)   You shall have received letters addressed to you and dated the date hereof and the Closing Date or the Additional Closing Date, as the case may be, from the firm of Grant Thornton LLP, independent certified public accountants, substantially in the forms heretofore approved by you.

        (h)   (i) No stop order suspending the effectiveness of the Registration Statement shall have been issued by the Commission and no proceedings for that purpose shall be pending or, to the knowledge of the Company, shall be threatened or contemplated by the Commission at or prior to the Closing Date or Additional Closing Date, as the case may be; (ii) no order suspending the effectiveness of the Registration Statement or the qualification or registration of the Units under the securities or Blue Sky laws of any jurisdiction shall be in effect and no proceeding for such purpose shall be pending or, to the knowledge of the Company, threatened or contemplated by the authorities of any jurisdiction; (iii) any request for additional information on the part of the staff of the Commission or any such authorities shall have been complied with to the satisfaction of the staff of the Commission or such authorities; (iv) after the date hereof, no amendment or supplement to the Registration Statement or the Prospectus shall have been filed unless a copy thereof was first submitted to you and you did not object thereto in good faith; and (v) all of the representations and warranties of the Company contained in this Agreement shall be true and correct in all material respects (except for such representations and warranties qualified by materiality, which representations and warranties shall be true and correct in all respects) on and as of the date hereof and on and as of the Closing Date or Additional Closing Date, as the case may be, as if made on and as of the Closing Date or Additional Closing Date, as the case may be, and you shall have received a certificate, dated the Closing Date or the Additional Closing Date, as the case may be, and signed by the chief executive officer and the chief financial officer of the Company (or such other officers as are acceptable to you) to the effect set forth in this Section 9(h) and in Sections 9(c) and 9(j) hereof.

        (i)    Neither the Company nor the Trust shall not have failed in any material respect at or prior to the Closing Date or the Additional Closing Date, as the case may be, to have performed or complied with any of its agreements herein contained and required to be performed or complied with by it hereunder at or prior to the Closing Date or Additional Closing Date, as the case may be.

        (j)    The Company shall have furnished or caused to have been furnished to you such further certificates and documents as you shall have reasonably requested.

        (k)   At or prior to the Closing Date, you shall have received the written commitment Lock-Up Agreements from each of the Selling Unitholders not to directly or indirectly (i) sell, offer or contract to sell or otherwise dispose of or transfer any Trust Securities, whether now owned or acquired after the date of the Prospectus or with respect to which the power of disposition is acquired after the date of the Prospectus, or file any registration statement under the Act with respect to the foregoing or (ii) enter into any swap or other agreement or any other agreement that transfers, in whole or in part, directly or indirectly, the economic consequences of ownership of Trust Securities whether any such swap or transaction is to be settled by delivery of Trust Securities, in cash or otherwise; other than as provided in such written commitment before the expiration of 180 days from the Closing Date, without the prior written consent of Raymond James & Associates, Inc.

        (l)    At or prior to the effective date of the Registration Statement, you shall have received a letter from the Corporate Financing Department of the NASD confirming that such Department has determined to raise no objections with respect to the fairness or reasonableness of the underwriting terms and arrangements of the offering contemplated hereby.

29

        (m)  You shall have received letters addressed to you and dated the Closing Date or the Additional Closing Date, as the case may be, from Cawley Gillespie stating the conclusions and findings of such firm with respect to oil and gas reserves of the Company, substantially in the form approved by you.

        (n)   At or prior to the Closing Date, the Company shall have (i) filed the Conveyance in counties covering not less than [90]% of producing wells covered by the Conveyance and (ii) a UCC-1 financing statement in Topeka, Kansas giving notice of the security interest created by the Conveyance.

        (o)   You shall be satisfied that, and you shall have received a certificate dated the Closing Date or Additional Closing Date, as the case may be, from each Selling Stockholder to the effect that, as of the Closing Date or Additional Closing Date, as the case may be: (i) the representations and warranties made by such Selling Unitholders herein are true and correct in all material respect on the Closing Date or Additional Closing Date, as the case may be, and (ii) such Selling Unitholder has complied with all obligations and satisfied all conditions that are required to be performed or satisfied on his or its part at or prior to the Additional Closing Date or Closing Date, as the case may be.

        All such opinions, certificates, letters and other documents will be in compliance with the provisions hereof only if they are reasonably satisfactory in form and substance to you and your counsel.

        The several obligations of the Underwriters to purchase Additional Units hereunder are subject to the satisfaction on and as of the Additional Closing Date of the conditions set forth in this Section 9, except that, if the Additional Closing Date is other than the Closing Date, the certificates, opinions and letters referred to in this Section 9 shall be dated as of the Additional Closing Date and the opinions called for by paragraphs (d) and (e) shall be revised to reflect the sale of Additional Units.

        If any of the conditions hereinabove provided for in this Section 9 shall not have been satisfied when and as required by this Agreement, this Agreement may be terminated by you by notifying the Company of such termination in writing or by telegram at or prior to such Closing Date, but you shall be entitled to waive any of such conditions.

        10.   Effective Date of Agreement. This Agreement shall become effective upon the later of (a) the execution and delivery hereof by the parties hereto and (b) release of notification of the effectiveness of the Registration Statement by the Commission; provided, however, that the provisions of Sections 7 and 8 shall at all times be effective.

        11.   Defaulting Underwriters. If any one or more of the Underwriters shall fail or refuse to purchase Firm Units that it or they have agreed to purchase hereunder, and the aggregate number of Firm Units that such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate number of the Firm Units, each non-defaulting Underwriter shall be obligated, severally, in the proportion in which the number of Firm Units set forth opposite its name in Schedule I hereto bears to the aggregate number of Firm Units set forth opposite the names of all non-defaulting Underwriters or in such other proportion as you may specify in the Agreement Among Underwriters, to purchase the Firm Units that such defaulting Underwriter or Underwriters agreed, but failed or refused to purchase. If any Underwriter or Underwriters shall fail or refuse to purchase Firm Units and the aggregate number of Firm Units with respect to which such default occurs is more than one-tenth of the aggregate number of Firm Units and arrangements satisfactory to you and the Company for the purchase of such Firm Units are not made within 48 hours after such default, this Agreement will terminate without liability on the part of any non-defaulting Underwriter or the Company. In any such case that does not result in termination of this Agreement, either you or the Company shall have the right to postpone the Closing Date, but in no event for longer than seven (7) days, in order that the required changes, if any, in the Registration Statement and the Prospectus or any other documents or arrangements may be effected. Any action taken under this paragraph shall not

30

relieve any defaulting Underwriter from liability in respect of any such default of any such Underwriter under this Agreement.

        12.   Termination of Agreement. This Agreement shall be subject to termination in your absolute discretion, without liability on the part of any Underwriter to the Company by notice to the Company, if prior to the Closing Date or the Additional Closing Date (if different from the Closing Date and then only as to the Additional Units), as the case may be, in your sole judgment, (i) trading in the Trust Units shall have been suspended by the Commission or the NYSE, (ii) trading in securities generally on the NYSE or NASDAQ shall have been suspended or materially limited, or minimum or maximum prices shall have been generally established on such exchange, or additional material governmental restrictions, not in force on the date of this Agreement, shall have been imposed upon trading in securities generally by any such exchange or by order of the Commission or any court or other governmental authority, (iii) a general moratorium on commercial banking activities shall have been declared by either federal or New York State authorities or (iv) there shall have occurred any outbreak or escalation of hostilities or other international or domestic calamity, crisis or change in political, financial or economic conditions or other material event the effect of which on the financial markets of the United States is such as to make it, in your judgment, impracticable or inadvisable to market the Units or to enforce contracts for the sale of the Units. Notice of such cancellation shall be promptly given to the Company and its counsel by telegraph, telecopy or telephone and shall be subsequently confirmed by letter.

        13.   Information Furnished by the Underwriters. The Company acknowledges that (i) the list of Underwriters and their respective participation in the sale of Units, (ii) the first and second sentences of the third paragraph and (iii) eleventh through sixteenth paragraphs, each under the caption "Underwriting" in any Preliminary Prospectus, constitute the only information furnished by or on behalf of the Underwriters through you or on your behalf as such information is referred to in Sections 6(c), 6.1(d) and 8 hereof.

        14.   Miscellaneous. Except as otherwise provided in Sections 5 and 12 hereof, notice given pursuant to any of the provisions of this Agreement shall be in writing and shall be delivered

(i)

to the Company

MV Partners, LLC
250 N. Water, Suite 300
Wichita, Kansas 67202
Attention: David L. Murfin

with a copy to

Vinson & Elkins L.L.P.
1001 Fannin Street, Suite 2300
Houston, Texas 77002
Attention: Thomas P. Mason

(ii)

to the Trust

The Bank of New York Trust Company, N.A.
Global Corporate Trust
221 West Sixth Street, 1st Floor
Austin, Texas 78701
Attention: Mike J. Ulrich

with a copy to

31

Andrews Kurth LLP
600 Travis
Suite 4200
Houston, Texas 77002
Attention: David C. Buck

(iii)

to the Selling Unitholders

[NAME]
[ADDRESS]
Attention: [                        ]

(iv)

to the Underwriters

Raymond James & Associates, Inc.
880 Carillon Parkway
St. Petersburg, Florida 33716
Attention: [                        ]

with a copy to

Baker Botts L.L.P.
One Shell Plaza
910 Louisiana Street, Suite 3200
Houston, Texas 77002
Attention: R. Joel Swanson, Jr.

        This Agreement has been and is made solely for the benefit of the several Underwriters, the Company and its manager and officers, the Trust and the Selling Unitholders.

        15.   No Fiduciary Duty. Notwithstanding any preexisting relationship, advisory or otherwise, between the parties or any oral representations or assurances previously or subsequently made by any of the Underwriters, each of the Company and the Selling Unitholders acknowledges and agrees that (i) nothing herein shall create a fiduciary or agency relationship between the Company or the Selling Unitholders, on the one hand, and the Underwriters, on the other hand; (ii) the Underwriters have been retained solely to act as underwriters and are not acting as advisors, expert or otherwise, to either the Company or the Selling Unitholders in connection with this offering, the sale of the Units or any other services the Underwriters may be deemed to be providing hereunder, including, without limitation, with respect to the public offering price of the Units; (iii) the relationship between the Company and the Selling Unitholders, on the one hand, and the Underwriters, on the other hand, is entirely and solely commercial, and the price of the Units was established by the Company, the Selling Unitholders and the Underwriters based on discussions and arms' length negotiations and each of the Company and the Selling Unitholders understands and accepts the terms, risks and conditions of the transactions contemplated by this Agreement; (iv) any duties and obligations that the Underwriters may have to the Company or the Selling Unitholders shall be limited to those duties and obligations specifically stated herein; and (v) notwithstanding anything in this Agreement to the contrary, each of the Company and the Selling Unitholders acknowledges that the Underwriters may have financial interests in the success of the Offering that are not limited to the difference between the price to the public and the purchase price paid to the Company and the Selling Unitholders by the Underwriters for the shares and that such interests may differ from the interests of the Company and the Selling Unitholders, and the Underwriters have no obligation to disclose, or account to the Company or the Selling Unitholders for any benefit that they may derive from, such additional financial interests. Each of the Company and the Selling Unitholders hereby waives and releases, to the fullest extent permitted by applicable law, any claims that the Company or the may have against the Underwriters with respect to any breach or alleged breach of fiduciary duty and agree that the Underwriters shall have no liability

32

(whether direct or indirect) to the Company in respect of such a fiduciary duty claim or to any person asserting a fiduciary duty claim on behalf of or in right of the Company or any of their respective members, managers, employees or creditors.

        16.   Applicable Law; Counterparts. This Agreement shall be governed by and construed in accordance with the laws of the State of Florida without reference to choice of law principles thereunder.

        This Agreement may be signed in various counterparts, which together shall constitute one and the same instrument.

        This Agreement shall be effective when, but only when, at least one counterpart hereof shall have been executed on behalf of each party hereto.

        The Company and the Underwriters each hereby irrevocably waive any right they may have to a trial by jury in respect to any claim based upon or arising out of this Agreement or the transactions contemplated hereby.

33

        Please confirm that the foregoing correctly sets forth the agreement among the Company, the Trust, the Selling Unitholders and the several Underwriters.

	Very truly yours,
	MV PARTNERS, LLC
	By:	MV Energy, LLC, its Manager
	By:	Murfin, Inc., Member
	By:
		Name: David L. Murfin Title: Chairman and Chief Executive Officer
	MV OIL TRUST
	By:	JPMorgan Chase Bank N.A., Trustee
	By:
		Name: Mike J. Ulrich Title: [                        ]
	The Selling Unitholders Named in Schedule II Hereof, Acting Severally
	By:
		Name: [                        ] Title: Attorney-in-Fact
CONFIRMED as of the date first above mentioned, on behalf of the Representative and the other several Underwriters named in Schedule I hereto.
RAYMOND JAMES & ASSOCIATES, INC.

By:
	Authorized Representative

34

SCHEDULE I

Name	Number Firm Units
Raymond James & Associates, Inc.	[            ]
A.G. Edwards & Sons, Inc.	[            ]
RBC Capital Markets Corporation	[            ]
Oppenheimer & Co., Inc.	[            ]
Total:	7,500,000

35

SCHEDULE II

Schedule of Selling Unitholders

Unitholder	Number of Additional Units to be Sold
MV Energy, LLC	562,500
VAP-I, LLC	562,500

36

SCHEDULE III

Free Writing Prospectuses

37

EXHIBIT A

                        , 2006

MV PARTNERS, LLC
250 N. Water, Suite 300
Wichita, Kansas 67202

RAYMOND JAMES & ASSOCIATES, INC.
As Representative of the Several Underwriters
c/o Raymond James & Associates, Inc.
880 Carillon Parkway
St. Petersburg, Florida 33716

Re: MV Partners, LLC (the "Company")—Restriction on Unit Sales

Dear Sirs:

        This letter is delivered to you pursuant to the Underwriting Agreement (the "Underwriting Agreement") to be entered into by the Company, as issuer, the Trust, the Selling Unitholders, and Raymond James & Associates, Inc., the representative (the "Representative") of certain underwriters (the "Underwriters") to be named therein. Upon the terms and subject to the conditions of the Underwriting Agreement, (i) the Company proposes to sell to the Underwriters units of beneficial interest (the "Units") in the Trust, a statutory trust formed under the laws of the State of Delaware, and (ii) the Underwriters intend to effect a public offering of the Units, as described in and contemplated by the registration statement of the Trust and the Company on Form S-1, File No. 333-136609 (the "Registration Statement"), as filed with the Securities and Exchange Commission on August 14, 2006 and as amended thereafter (the "Offering").

        The undersigned recognizes that it is in the best financial interests of the undersigned, as an officer or manager of the Company, or an owner of Units or other securities of the Trust or other securities that are derived from the Subject Interests that are substantially similar to the Units (the "Trust Securities"), that the Company and Trust complete the proposed Offering.

        The undersigned further recognizes that the Trust Securities held by the undersigned are, or may be, subject to certain restrictions on transferability, including those imposed by United States federal securities laws. Notwithstanding these restrictions, the undersigned has agreed to enter into this letter agreement to further assure the Underwriters that the Trust Securities of the undersigned, now held or hereafter acquired, will not enter the public market at a time that might impair the underwriting effort.

        Therefore, as an inducement to the Underwriters to execute the Underwriting Agreement, the undersigned hereby acknowledges and agrees that the undersigned will not (i) offer, sell, contract to sell, pledge, grant any option to purchase or otherwise dispose of (collectively, a "Disposition") any Trust Securities, or any securities convertible into or exercisable or exchangeable for, or any rights to purchase or otherwise acquire, any Trust Securities held by the undersigned or acquired by the undersigned after the date hereof, or that may be deemed to be beneficially owned by the undersigned (collectively, the "Lock-Up Units"), pursuant to the Rules and Regulations promulgated under the Securities Act of 1933, as amended (the "Act"), and the Securities Exchange Act of 1934, as amended, for a period commencing on the date hereof and ending 180 days after the date of the Company's Prospectus first filed pursuant to Rule 424(b) under the Act, inclusive (the "Lock-Up Period"), without the prior written consent of Raymond James & Associates, Inc. or (ii) exercise or seek to exercise or effectuate in any manner any rights of any nature that the undersigned has or may have hereafter to require the Trust to register under the Act the undersigned's sale, transfer or other disposition of any of the Lock-Up Units or other securities of the Company held by the undersigned, or to otherwise

38

participate as a selling securityholder in any manner in any registration effected by the Company under the Act, including under the Registration Statement, during the Lock-Up Period, notwithstanding the foregoing, if (x) during the last 17 days of the Lock-Up Period, the company issues a release concerning earnings or material news or a material event relating to the company occurs; or (y) prior to the expiration of the Lock-Up Period, the company announces it will release earnings results during the 16 day period beginning on the last day of the Lock-Up Period; the restrictions imposed in this letter agreement shall continue to apply until the expiration of the 18 day period beginning on the issuance of the earnings release or the occurrence of the material news or material event. The foregoing restrictions are expressly agreed to preclude the undersigned from engaging in any hedging, collar (whether or not for any consideration) or other transaction that is designed to or reasonably expected to lead or result in a Disposition of Lock-Up Units during the Lock-Up Period, even if such Lock-Up Units would be disposed of by someone other than such holder. Such prohibited hedging or other transactions would include any short sale or any purchase, sale or grant of any right (including any put or call option or reversal or cancellation thereof) with respect to any Lock-Up Units or with respect to any security (other than a broad-based market basket or index) that includes, relates to or derives any significant part of its value from Lock-Up Units.

        Notwithstanding the agreement not to make any Disposition during the Lock-Up Period, you have agreed that the foregoing restrictions shall not apply to the Trust Securities being offered in the prospectus included in the Registration Statement.

        It is understood that, if the Underwriting Agreement (other than the provisions thereof that survive termination) shall terminate or be terminated prior to payment for and delivery of the Units, you will release the undersigned from the obligations under this letter agreement.

        In furtherance of the foregoing, the Company and its transfer agent and registrar are hereby authorized to decline to make any transfer of Lock-Up Units if such transfer would constitute a violation or breach of this letter. This letter shall be binding on the undersigned and the respective successors, heirs, personal representatives and assigns of the undersigned. Capitalized terms used but not defined herein have the respective meanings assigned to such terms in the Underwriting Agreement.

Very truly yours,

Signature of Securityholder

39

QuickLinks

7,500,000 Trust Units MV OIL TRUST UNDERWRITING AGREEMENT
SCHEDULE I
SCHEDULE II Schedule of Selling Unitholders
SCHEDULE III Free Writing Prospectuses
EXHIBIT A
Re: MV Partners, LLC (the "Company")—Restriction on Unit Sales