Independent units eliminate the need to adjust dolly width for different vehicle designs . Each unit has an independently adjustable threaded lift saddle with rubber pads to protect the vehicle frame . Universal design for use on all vehicle types without additional adapters . Provides easy movement of a FWD vehicle after removal of the drive train. Each unit has a capacity of 1800 lbs. (3600 lbs., pair) with a low height of 9" and a high of 14"If you have the wheels, engine cradle, axle or front suspension removed and need to move the vehicle on the shop floor, this is a "must have"! Innovative patent-pending design clamps directly to pinch welds to prevent slippage during use. Attaches to the underside of the vehicle and allows easy moving of the vehicle that has the wheels or suspension removed. 5in. polypropylene casters. May be used with or without tires on the vehicle.