This invention is a lift kit for conventional trailers which include a foldable tailgate or trailer ramps mounted for pivotal movement about a gate or ramp axis from a transport position wherein the gate or ramps are elevated for transport to an unload position wherein the gate is lowered to permit removal of objects carried on the trailer, which incorporates a heavy duty helical elongated spring having a plurality of coils with one end fixedly mounted at the trailer end, and at the other end of the spring an adjustment which resists the force of gravity as the gate or ramps move from its upper travel position to its lower unload position which is fixedly mounted to the trailer gate or trailer ramp.