Exhibit 5.5

July 16, 2015

Genesis Energy, L.P.

919 Milam, Suite 2100

Houston, Texas 77002

Re: Genesis Energy, L.P.

Post-Effective Amendment No. 2 to Registration Statement Form S-3

Ladies and Gentlemen:

We have acted as counsel to Genesis Energy, L.P., a Delaware limited partnership (the “Partnership”), in connection with the registration, pursuant to a registration statement on Form S-3 (File No. 333-203259), as amended by Post-Effective Amendment No. 1 and Post-Effective Amendment No. 2 (as so amended, the “Registration Statement”), filed with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Act”), relating to the offering and sale from time to time, as set forth in the Registration Statement, the form of prospectus contained therein (the “Prospectus”), and one or more supplements to the Prospectus (each, a “Prospectus Supplement”), of an indeterminate aggregate amount of securities (the “Securities”) consisting of, among other things, (a) preferred securities (the “Preferred Securities”) representing limited partnership interests in the Partnership, (b) subordinated securities (the “Subordinated Securities” and, together with the Preferred Securities, the “LP Equity Securities”) representing limited partnership interests in the Partnership, (c) the Partnership’s warrants to purchase LP Equity Securities or Debt Securities (defined below) (the “Warrants”), (d) the Partnership’s senior debt securities, as to which the Partnership’s subsidiary, Genesis Energy Finance Corporation, a Delaware corporation (“Genesis Finance”), may be co-issuer, in one or more series (the “Senior Debt Securities”), and the Partnership’s subordinated debt securities, as to which Genesis Finance may be co-issuer, in one or more series (the “Subordinated Debt Securities” and, together with the Senior Debt Securities, the “Partnership Debt Securities”) and (e) guarantees (the “Guarantees”) of Partnership Debt Securities by the subsidiaries (the “Subsidiary Guarantors”) listed on Schedule I hereto and named in the Registration Statement (the Partnership Debt Securities, together with (if such Partnership Debt Securities have been guaranteed by Subsidiary Guarantors) the related Guarantees of such Subsidiary Guarantors, being referred to herein as the “Debt Securities”) or any combination of the foregoing, each on terms to be determined at the time of each offering. For purposes of this opinion, the term “Specified Subsidiary Guarantors” means the Subsidiary Guarantors listed on Schedule II hereto and named in the Registration Statement; and the term “Other Subsidiary Guarantors” means the Subsidiary Guarantors other than the Specified Subsidiary Guarantors. The Specified Subsidiary Guarantors have been added to the Registration Statement as registrants pursuant to Post-Effective Amendment No. 2 thereto. This opinion is being furnished at the request of the Partnership and in accordance with the requirements of Item 601(b)(5) of Regulation S-K under the Act with respect to the validity of any Guarantees by the Specified Guarantors of Partnership Debt Securities that may be offered pursuant to the Registration Statement.

Genesis Energy, L.P.

July 16, 2015

Page 2

We have examined originals or certified copies of (i) a form of the Indenture for the Senior Debt Securities filed as Exhibit 4.12 to the Registration Statement to be entered into by the Partnership, Genesis Finance, the Subsidiary Guarantors and U.S. Bank National Association, as trustee, the form and terms (including whether Genesis Finance is co-issuer thereof and any Guarantees) of any series of Partnership Debt Securities issued under such Indenture to be established by and set forth in an officers’ certificate or supplemental indenture to such Indenture, (ii) a form of the Indenture for the Subordinated Debt Securities filed as Exhibit 4.13 to the Registration Statement to be entered into by the Partnership, Genesis Finance, the Subsidiary Guarantors and U.S. Bank National Association, as trustee (together with the trustee referred to in (i), each a “Trustee”) (the indentures in (i) and (ii) are each referred to herein as an “Indenture”), the form and terms (including whether Genesis Finance is co-issuer thereof and any Guarantees) of any series of Partnership Debt Securities issued under such Indenture to be established by and set forth in an officers’ certificate or a supplemental indenture to such Indenture and (iii) the agreement of limited partnership of the Partnership as in effect on the date hereof (the “Partnership Agreement”) and such other partnership, corporate, or limited liability company records of the Partnership, Genesis Finance and the Specified Subsidiary Guarantors and other certificates and documents of officials of the Partnership, Genesis Finance and the Specified Subsidiary Guarantors and public officials and others as we have deemed appropriate for purposes of this letter. We have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, and the conformity to authentic original documents of all copies submitted to us as conformed and certified or reproduced copies. We have also assumed the existence and entity power of each party to the Indenture other than the Specified Subsidiary Guarantors. As to various questions of fact relevant to this letter, we have relied, without independent investigation, upon certificates of public officials and certificates of officers of the general partner of the Partnership, Genesis Finance, the Specified Subsidiary Guarantors and the Other Subsidiary Guarantors, all of which we assume to be true, correct and complete.

Based upon the foregoing and subject to the assumptions, exceptions, qualifications and limitations set forth hereinafter, we are of the opinion that:

1. When (i) the Partnership and, if applicable, Genesis Finance have issued Partnership Debt Securities guaranteed by Guarantees of the Specified Subsidiary Guarantors, (ii) the Subsidiary Guarantors (together with the Partnership and Genesis Finance, the “Obligors”) have taken all necessary action to establish the form and terms of such Guarantees and to authorize and approve the issuance of such Guarantees, the terms of the offering thereof and related matters, (iii) the applicable Indenture in substantially the form filed as an exhibit to the Registration Statement and any officers’ certificate or supplemental indenture

Genesis Energy, L.P.

July 16, 2015

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thereto relating to such Debt Securities have been duly authorized, executed and delivered by the parties thereto (including the Specified Subsidiary Guarantors) with the terms of such Guarantees having been set forth in such Indenture or a supplemental indenture or an officers’ certificate delivered pursuant thereto, (iv) the Trustee under the applicable Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended (the “TIA”), (v) any notations of such Guarantees on such Partnership Debt Securities have been duly executed, authenticated, issued and delivered in accordance with the terms of the applicable Indenture and the applicable resolution of the Board of Directors of the general partner of the Partnership or duly authorized committee thereof (the “GP Board”) and, if such Debt Securities constitute Partnership Debt Securities as to which Genesis Finance is co-issuer, the applicable resolution of the Board of Directors of Genesis Finance or duly authorized committee thereof (the “Finance Board”) or supplemental indenture relating to such Guarantees and the applicable definitive purchase, underwriting or similar agreement against payment (or delivery) of the consideration therefor provided for therein, or, if such Debt Securities are issuable upon exchange or conversion of Securities constituting Preferred Securities or Subordinated Securities, the amendment to the Partnership Agreement or certificate of designations therefor, or if such Debt Securities are issuable upon exercise of Securities constituting Warrants, the applicable warrant agreement therefor, against payment (or delivery) of the consideration therefor provided for therein, and (vi) such Guarantees (including any such Guarantees of Securities duly issued upon (a) exchange or conversion of Securities constituting any Preferred Securities or Subordinated Securities that are exchangeable for or convertible into Debt Securities, or (b) exercise of Securities constituting any Warrants that are exercisable for Debt Securities) (x) will have been duly authorized by all necessary limited liability company action on the part of each of the applicable Specified Subsidiary Guarantors and (y) will be valid and binding obligations of each such Specified Subsidiary Guarantor, enforceable against such Specified Subsidiary Guarantor in accordance with their terms.

The opinions and other matters in this letter are qualified in their entirety and subject to the following:

(A) We have assumed that, in the case of each offering and sale of Partnership Debt Securities guaranteed by Guarantees of the Specified Subsidiary Guarantors, (i) the Registration Statement, and any amendments thereto (including post-effective amendments), will have become effective under the Act and the Indenture will have been qualified under the TIA and such effectiveness or qualification shall not have been terminated or rescinded; (ii) a Prospectus Supplement will have been prepared and filed with the Commission describing

Genesis Energy, L.P.

July 16, 2015

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such Guarantees; (iii) such Securities will have been issued and sold in compliance with applicable United States federal and state securities Laws (hereinafter defined) and pursuant to and in the manner stated in the Registration Statement and the applicable Prospectus Supplement; (iv) unless such Debt Securities are issuable upon exercise of Securities constituting Warrants or upon exchange or conversion of Securities constituting Preferred Securities or Subordinated Securities, a definitive purchase, underwriting or similar agreement with respect to the issuance and sale of such Guarantees will have been duly authorized, executed and delivered by the Specified Subsidiary Guarantors; (v) at the time of the issuance of such Guarantees, each of the Specified Subsidiary Guarantors (a) will continue to be validly existing and duly qualified and in good standing under the laws of its jurisdiction of formation and (b) will continue to have the necessary limited liability company power and due authorization, and the organizational documents of such Specified Subsidiary Guarantors will be in full force and effect and will not have been amended, restated, supplemented or otherwise altered, and there will have been no authorization of any such amendment, restatement, supplement or other alteration, since the date hereof; (vi) the terms of such Guarantees and of their issuance and sale will have been established in conformity with and so as not to violate, or result in a default under or breach of, the organizational document of each of the Specified Subsidiary Guarantors, and the terms of such Guarantees and of their issuance and sale will have been established in conformity with and so as not to violate, or result in a default under or breach of any applicable law, regulation or administrative order or any agreement or instrument binding upon any such Specified Subsidiary Guarantor and so as to comply with any requirement or restriction imposed by any court or governmental or regulatory body (including any securities exchange on which the Partnership’s securities are listed for trading) having jurisdiction over any such Specified Subsidiary Guarantor and, in conformity with the applicable Indenture, supplemental indenture or officers’ certificate and the applicable resolution of the GP Board and, if such Debt Securities constitute Partnership Debt Securities as to which Genesis Finance is co-issuer, the applicable Indenture, supplemental indenture or officers’ certificate and the applicable resolution of the Finance Board, (vii) the officers’ certificate or supplemental indenture to the related Indenture establishing any terms different from those in such Indenture shall not include any provision that is unenforceable against the applicable Specified Subsidiary Guarantors; (viii) the applicable Indenture will constitute the legal, valid and binding obligation of each party thereto (other than each of the applicable Specified Subsidiary Guarantors), enforceable against such party in accordance with its terms; and (ix) such action will have been taken with respect to the Partnership Debt Securities guaranteed by the Guarantees of the Specified Guarantors (and if such Debt Securities are

Genesis Energy, L.P.

July 16, 2015

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issuable upon exercise of Securities constituting Warrants or upon exchange or conversion of Securities constituting Preferred Securities or Subordinated Securities, such Warrants, Preferred Securities or Subordinated Securities) such that such Partnership Debt Securities and any Guarantees thereof by any Subsidiary Guarantors (other than the Specified Subsidiary Guarantors) constitute valid and binding obligations of each Obligor (other than the Specified Subsidiary Guarantors).

(B) We express no opinion as to the laws of any jurisdiction other than any published constitutions, treaties, laws, rules or regulations or judicial or administrative decisions (“Laws”) of (i) the federal Laws of the United States; (ii) the Limited Liability Company Act of the State of Delaware (the “Delaware LLC Act”); and (iii) the Laws of the State of New York. As used herein, the term “Delaware LLC Act” includes the statutory provisions contained therein and all applicable provisions of the Delaware Constitution and reported judicial decisions interpreting this law.

(C) The matters expressed in this letter are subject to and qualified and limited by (i) applicable bankruptcy, insolvency, fraudulent transfer and conveyance, reorganization, moratorium and similar laws affecting creditors’ rights and remedies generally; (ii) general principles of equity, including without limitation, concepts of materiality, reasonableness, good faith and fair dealing and the possible unavailability of specific performance or injunctive relief (regardless of whether considered in a proceeding in equity or at law); and (iii) securities Laws and public policy underlying such Laws with respect to rights to indemnification and contribution.

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Genesis Energy, L.P.

July 16, 2015

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We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the use of our name in the Prospectus under the caption “Legal Matters.” In giving this consent, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Act and the rules and regulations thereunder.

Very truly yours,

/s/ AKIN GUMP STRAUSS HAUER & FELD LLP

AKIN GUMP STRAUSS HAUER & FELD LLP

Schedule I

Subsidiary Guarantors

	Jurisdiction of Formation or Organization
Antelope Refining, LLC	Delaware
AP Marine, LLC	Delaware
BR Port Services, LLC	Delaware
Casper Express Pipeline, LLC	Delaware
Davison Petroleum Supply, LLC	Delaware
Davison Transportation Services, Inc.	Delaware
Davison Transportation Services, LLC	Delaware
GEL CHOPS GP, LLC	Delaware
GEL CHOPS I, L.P.	Delaware
GEL CHOPS II, L.P.	Delaware
GEL Louisiana Fuels, LLC	Delaware
GEL Odyssey, LLC	Delaware
GEL Offshore Pipeline, LLC	Delaware
GEL Offshore, LLC	Delaware
GEL Poseidon, LLC	Delaware
GEL PRCS, LLC	Delaware
GEL Sekco, LLC	Delaware
GEL Tex Marketing, LLC	Delaware
GEL Texas Pipeline, LLC	Delaware
GEL Wyoming, LLC	Delaware
Genesis BR, LLC	Delaware
Genesis CHOPS I, LLC	Delaware
Genesis CHOPS II, LLC	Delaware
Genesis CO2 Pipeline, L.P.	Delaware
Genesis Crude Oil, L.P.	Delaware
Genesis Davison, LLC	Delaware
Genesis Energy, LLC	Delaware
Genesis Free State Holdings, LLC	Delaware
Genesis Marine, LLC	Delaware
Genesis Natural Gas Pipeline, L.P.	Delaware
Genesis NEJD Holdings, LLC	Delaware
Genesis Odyssey, LLC	Delaware
Genesis Offshore, LLC	Delaware
Genesis Offshore Holdings, LLC	Delaware
Genesis Pipeline Alabama, LLC	Alabama
Genesis Pipeline Texas, L.P.	Delaware
Genesis Pipeline USA, L.P.	Delaware
Genesis Poseidon, LLC	Delaware

Genesis Energy, L.P.

July 16, 2015

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	Jurisdiction of Formation or Organization
Genesis Poseidon Holdings, LLC	Delaware
Genesis Rail Services, LLC	Delaware
Genesis Sailfish Holdings, LLC	Delaware
Genesis Sekco, LLC	Delaware
Genesis Syngas Investments, L.P.	Delaware
Milam Services, Inc.	Delaware
Powder River Crude Services, LLC	Delaware
Powder River Express, LLC	Delaware
Powder River Operating, LLC	Delaware
Pronghorn Rail Services, LLC	Delaware
Red River Terminals, L.L.C.	Louisiana
TBP2, LLC	Delaware
TDC Services, LLC	Delaware
TDC, L.L.C.	Louisiana
Texas City Crude Oil Terminal, LLC	Delaware
Thunder Basin Holdings, LLC	Delaware
Thunder Basin Pipeline, LLC	Delaware

Schedule II

Specified Subsidiary Guarantors

	Jurisdiction of Formation or Organization
Genesis Offshore Holdings, LLC	Delaware
Genesis Poseidon Holdings, LLC	Delaware
Genesis Sailfish Holdings, LLC	Delaware