"A great way to reduce back strain during the long haul. Easily maneuver large step deck trailer loading ramp systems in only a few minutes with a dual wheel axle dolly. The ingenious ramp dolly enables heavy duty ramps to roll on one end across flat parking lots and rest stops, bearing the brunt of a ramp's weight on the axle. Works with hook-end, flat plate, and pin-end style truck ramps up to 20"" wide and supports up to 220 lbs."