Device for loading and unloading or tipping a load unit, intended for a vehicle

Device for winding/unwinding and for tipping a loading device on a motor vehicle comprises a hook device (29) and a sliding component (36) arranged on the vehicle chassis and connected to the hook device. The hook device has a hook arm (31) and a base arm (37) arranged on the vehicle chassis. The hook arm is coupled to the base arm via an intermediate arm (34) so that the intermediate arm tilts relative to the hook arm and relative to the base arm.