A mobile vehicle service trailer provides a portable maintenance facility for motor vehicles (passenger cars, pickup trucks and sport utility vehicles, etc.) without need to transport the vehicle to a maintenance facility at a fixed location. The present trailer has rearwardly disposed wheels and laterally extendible ramps, enabling the trailer to be positioned laterally at the front or rear of the vehicle needing service and the vehicle to be positioned laterally across the trailer. This configuration provides for ease of loading and unloading the vehicle to and from the trailer in cramped parking situations, such as parking lots and garages, etc. The rear wheels of the trailer are pivotally mounted, allowing the trailer body to be lowered to the underlying surface for placement of a vehicle thereon. A specially formed trailer hitch may be provided for the towing vehicle, allowing the hitch ball to be lowered to the underlying surface to lower the trailer tongue without disconnecting the trailer from the towing vehicle. Corner jacks are provided for raising and lowering the trailer body as desired. A forward and a rearward hydraulically powered lift hoist are provided on the trailer body, for raising the vehicle for access to the underside thereof for maintenance operations (oil changes, etc.). The present trailer also includes a hydraulic power supply for operating the corner jacks, vehicle hoists, and for raising and lowering the ramps as desired.