SECURITY AGREEMENT SUPPLEMENT

Exhibit 10.5

SECURITY AGREEMENT SUPPLEMENT

April 30, 2012

Ladies and Gentlemen:

Reference is made to (i) the Amended and Restated Credit Agreement, dated as of October 14, 2011 (as amended, restated, extended, supplemented or otherwise modified in writing from time to time, the “Credit Agreement”), among United Rentals, Inc., a Delaware corporation (“Holdings”), United Rentals (North America), Inc., a Delaware corporation (the “Company”), the other U.S. Subsidiary Borrowers named therein (together with the Company, the “U.S. Borrowers”), United Rentals of Canada, Inc., a corporation amalgamated under the laws of the Province of Ontario (the “Canadian Borrower”), United Rentals Financing Limited Partnership (the “Specified Loan Borrower”), the Lenders from time to time party thereto, and Bank of America, N.A., as Agent and (ii) the Amended and Restated U.S. Security Agreement dated as of October 14, 2011 (as amended, amended and restated, supplemented or otherwise modified from time to time, the “Security Agreement”) made by the Grantors from time to time party thereto in favor of the Agent for the benefit of the Secured Parties. Terms defined in the Credit Agreement or the Security Agreement and not otherwise defined herein are used herein as defined in the Credit Agreement or the Security Agreement.

SECTION 1. Grant of Lien. (a) As security for the due and prompt payment and performance when due (whether at the stated maturity, by acceleration or otherwise) by each of the undersigned of all of its present and future Obligations (such Obligations, as to any of the undersigned, being the “Secured Obligations” of such undersigned), each of the undersigned hereby grants to the Agent, its successors and assigns, for the ratable benefit of the Secured Parties, a security interest (the “Security Interest”) in and continuing lien on all of such undersigned’s right, title and interest in or to any and all of the following properties and assets of such undersigned and all powers and rights of such undersigned in all of the following (including the power to transfer rights in the following), whether now owned or existing or at any time hereafter acquired or arising, regardless of where located (collectively, the “Collateral”):

(i) all Accounts;

(ii) all Inventory, including all Rental Equipment;

(iii) all leases of Inventory, Equipment and other Goods (whether or not in the form of a lease agreement), including all Leases;

(iv) all documentation evidencing rights in any Inventory or Equipment, including all certificates, certificates of title, manufacturer’s statements of origin, and other collateral instruments;

(v) all contract rights, including contract rights in respect of any Like-Kind Exchange;

(vi) all Chattel Paper;

(vii) all Documents;

(viii) all Instruments;

(ix) all Supporting Obligations and Letter-of-Credit Rights;

(x) all General Intangibles (including Payment Intangibles and Software);

(xi) all Goods;

(xii) all Equipment;

(xiii) all Investment Property, including the Security Collateral of such undersigned;

(xiv) all money, cash, cash equivalents, securities and other property of any kind of such undersigned held directly or indirectly by the Agent, any Lender or any of their Affiliates;

(xv) all of such undersigned’s Material Accounts, credits, and balances with and other claims against the Agent or any Lender or any of their Affiliates or any other financial institution with which such undersigned maintains deposits, including all Payment Accounts;

(xvi) all books, records and other property related to or referring to any of the foregoing, including books, records, account ledgers, data processing records, computer software and other property; and

(xvii) all accessions to, substitutions for and replacements, products and proceeds of any of the foregoing, including, but not limited to, proceeds of any insurance policies, claims against third parties, and condemnation or requisition payments with respect to all or any of the foregoing;

provided, however, the “Collateral” shall not include any asset or rights or interests of such undersigned as described in the proviso to Section 2(a) of the Security Agreement.

All of the Secured Obligations of any of the undersigned shall be secured by all of the Collateral of such undersigned and any other property of such undersigned that secures any of the Secured Obligations.

SECTION 2. Representations and Warranties. (a) Each of the undersigned represents and warrants to the Agent and the other Secured Parties that as of the date hereof: (i) Schedule I hereto identifies (A) such undersigned’s name as of the date hereof as it appears in official filings in the state or other jurisdiction of its incorporation or other organization, (B) the type of entity of such undersigned (including corporation, partnership, limited partnership or limited liability company), (C) the organizational identification number issued by such undersigned’s state,

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province or territory of incorporation or organization or a statement that no such number has been issued, and (D) the jurisdiction in which such undersigned is incorporated or organized; and (ii) such undersigned has only one state, province or territory of incorporation or organization.

(b) Each of the undersigned hereby makes each other representation and warranty set forth in the Security Agreement with respect to itself and the Collateral owned by it. Each of the undersigned hereby represents and warrants to the Agent and the other Secured Parties that the attached Schedule II contains all information with respect to itself and the Collateral owned by it that is required to be set forth in Schedule III to the Security Agreement with respect to the Grantors and their Collateral and the attached Schedule III contains all information with respect to itself and the Security Collateral owned by it that is required to be set forth in Schedule I to the Security Agreement with respect to the Grantors and their Security Collateral.

(c) Each of the undersigned hereby makes each representation and warranty set forth in the Credit Agreement that is made with respect to any U.S. Obligor.

SECTION 3. Obligations Under the Security Agreement. Each of the undersigned hereby agrees, as of the date first above written, to be bound as a Grantor by all of the terms and provisions of the Security Agreement to the same extent as each of the other Grantors. Each of the undersigned further agrees, as of the date first above written, that each reference in the Security Agreement to an “Additional Grantor” or a “Grantor” shall also mean and be a reference to each of the undersigned, that each reference to the “Collateral” or any part thereof shall also mean and be a reference to each of the undersigned’s Collateral or part thereof, as the case may be, and that each reference in the Security Agreement to a Schedule shall also mean and be a reference to the schedules attached hereto.

SECTION 4. Obligations under the Credit Agreement. Each of the undersigned hereby agrees, as of the date first above written, to be bound as an Obligor, U.S. Obligor, Guarantor and U.S. Guarantor by all of the terms and provisions of the Credit Agreement to the same extent as though such undersigned were a party to the Credit Agreement in each such capacity from and after the date hereof. Each of the undersigned further agrees, as of the date first above written, that each reference in the Credit Agreement to an “Obligor” or a “U.S. Obligor” or a “Guarantor” or “U.S. Guarantor” shall also mean and be a reference to such undersigned.

SECTION 5. Governing Law. This Security Agreement Supplement shall be governed by, and construed in accordance with, the laws of the State of New York.

SECTION 6. Removal of Immaterial Subsidiary Designation. As of the date hereof, Holdings has removed the designation of each of the undersigned as Immaterial Subsidiaries under the Credit Agreement. Accordingly, in connection therewith and concurrently with the effectiveness of this Security Agreement Supplement, as of the date hereof, the undersigned acknowledge that Section 25 of the Security Agreement shall be of no further force and effect.

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[Signature Page to Security Agreement Supplement]

SCHEDULE I

to

AGREEMENT

JURISDICTIONS OF ORGANIZATION

SCHEDULE II

to

AGREEMENT

PATENTS, TRADEMARKS AND COPYRIGHTS

Patents:

None.

Trademarks:

Copyrights:

SCHEDULE III

to

AGREEMENT

PLEDGED EQUITY AND PLEDGED DEBT

PART I

Pledged Equity:

99.83871% of the equity interest of Wynne Systems EMEA owned by Wynne Systems, Inc.

PART II

Pledged Debt:

Amended and Restated Global Intercompany Note, dated April 30, 2012.