English to Spanish Bus/Financial Automotive / Cars & Trucks

Un cliente me pidió que le tradujera un documento sobre dealerships y uno de los aspectos que más le interesa es saber la diferencia entre todos los tipos de concesionario. El documento no tiene definiciones como tal.

"Documents required with the application are:

...
-Copy of garage liability insurance signed by the garage liability insurance agent is required for all dealers listed above, except mobile home dealers not selling recreational vehicles and salvage dealers. The requirements are:

-- Independent dealers, **auction dealers**, and wholesale dealers have the option to submit:

--- A garage liability insurance certificate which shall include, at a minimum, $25,000 combined single-limit liability coverage including bodily injury and property damage protection and $10,000 personal injury protection or

--- A general liability insurance policy coupled with a business automobile policy which shall include, at a minimum, $25,000 combined single-limit liability coverage including bodily injury and property damage protection and $10,000 personal injury protection

-- Salvage dealers are exempt from submitting garage liability insurance coverage

-- Franchise dealers, recreational vehicle dealers, and mobile home dealers/brokers selling recreational vehicles must submit a garage liability insurance certificate which shall include, at a minimum, $25,000 combined single-limit liability coverage including bodily injury and property damage protection and $10,000 personal injury protection"

Hasta ahora, he colocado:

independent dealers = concesionarios independientes
wholesale dealers = concesionarios de vehículos al mayor
salvage dealers = concesionarios de vehículos de rescate/basura/reciclados/usados (lo consultaré aparte)
franchise dealers = concesionarios de franquicia
recreational vehicle dealers = concesionarios de vehículos recreativos
mobile home dealers = concesionarios de casas rodantes

auction dealers = ¿concesionario de vehículos de venta por subasta? Muchísimas gracias por adelantado por sus sugerencias.