Abstract: A longitudinal extensible platform comprises a plurality of framed sections hingedly joined together. Each framed section comprises a first set of ground engaging rollers and a second set of load engaging rollers extending transversely of the framed section. A drive is mounted below the surface of the loading dock for driving an endless chain. The extensible platform is drivingly engaged to the endless chain and adapted for longitudinal movement therealong. The extensible platform has a platen at a forward end hingedly engaging the first framed section. The extensible platform is provided with a driven pusher assembly mounted thereon. The pusher assembly extending upwardly for abutting with the load resting on the extensible platform.