GSA Federal Acquisition Service
For general questions, contact:
FAS National Customer Service Ctr
Phone: 1-800-488-3111

Vehicle Leasing and Rentals vans, light trucks...
MAS Multiple Award Schedule - Available offerings include commercial goods and services organized by 12 Large Categories, corresponding Subcategories, and SINs.

MAS Category list:

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Transportation and Logistics Services - Motor Vehicles (non-Combat)
Category Description
532112 Leasing of Passenger Cars, SUVs, Vans, and Light Trucks - Leasing of Passenger Cars, SUVs, Vans, and Light Trucks
Transportation and Logistics Services - Transportation of Things
Category Description
485 Ground Transportation - Ground Transportation Services utilizing Van, Motor Coach (Bus), or Limousine for both scheduled and unscheduled routes. Services are available for single or multiple passenger shuttle transportation between and among buildings; driver services; airport transport; and VIP transport; etc. within or between cities. All services necessary to provide passenger shuttle services. These services may include environmentally sustainable options designed through Environmental Protection Agency(EPA) SmartWay Program that reduce the impact of freight transport on the environment in the areas of fuel consumption, greenhouse gas, and emissions of air toxics.
532111 Automotive equipment rental and leasing, Rental Supplemental Vehicle Program (RSVP) - Includes rental services of vehicle types (including car, truck, and special equipment rentals such as trailers, refrigerated trucks, etc.) to supplement federal fleets and/or support official business vehicular needs for other than temporary duty travel purposes.

NOTE: Environmentally sustainable options may be available through Environmental Protection Agency's (EPA) SmartWay Program, which aims to reduce the environmental impact of freight transport.