This is an integrated cargo transportation device designed to be mounted on trucks. Operated via a control panel, it can transform into a conveyor belt for rapid loading and unloading of goods; unfold as stairs for manual loading and unloading; or create a temporary bridge between two vehicles for cargo transfer. In its closed state it serves as the truck’s rear door, incorporating taillights and ground-area projection warning features, further increasing operational safety and visibility. Its design saves manpower and resources while enhancing logistics’ efficiency and flexibility.