The ROGERS Jeep Dolly is a short trailer built complete with a kingpin, sliding fifth wheel, and suspension system. It is designed to act as an intermediate unit to divide the kingpin load of the trailer and the tractor AND to provide the necessary length between axle groups to meet DOT bridge formula regulations. The Jeep Dolly is similar to a Helper Dolly, but are commonly equipped with a sliding 5th wheel assembly mounted at the same fifth wheel height as the tractor. In order to utilize a Jeep Dolly, the most trailers must be designed and equipped with a Gooseneck Extender.