The invention relates to a transport vehicle with an extended longitudinal structure for a motor-driven handling device. Loads are loaded/unloaded in a loading space by a motor-driven handling device which moves along longitudinal guide rails supported by the vehicle. The transport vehicle is closed at the rear by two hinged doors, each door including a guide rail section located at the same height as the guide rails. When the hinged doors are open to 90 degrees, each guide rail section extends one of the guide rails, allowing the motor-driven handling device to move simultaneously on both the guide rails and the guide rail sections.