Abstract: A transport for loading semitrailers and other similar cargo carrying vehicles includes a portable conveyor shaped to extend into a trailer, and load the same from front to rear. The portable conveyor is preferably self-propelled, and has steerable front wheels at the downstream end of the conveyor, with a steering arm to manually pilot the conveyor into the trailer, and around the loading dock area. A guidance mechanism positions the portable conveyor in a selected storage position in the loading area, and comprises a pair of guides which depend from the upstream end of the conveyor, and matingly receive a floor mounted guide rail therebetween. Ramp blocks are located at the base end of the guide rail to positively and safely stop the conveyor in the storage position.