A movable bumper device mounted to the interior of a truck bed. The bumper device is capable of sliding from the front end of the truck bed (proximate the cab of the truck) to the rear end of the truck bed (proximate the tailgate). The current invention includes tracks mounted to the bottom surface of a truck bed. The bumper portion of the invention is mounted to those tracks by a track mounting system. By translating the bumper device towards the rear end of the truck, the device forces contents contained within the truck bed towards the rear end of the truck.