"This pair of aluminum lower ramp stands is designed for supporting pin-on end loading ramps. These stands are an essential part of any step deck trailer ramp system used for loading tractors, loaders, trucks, and heavy equipment onto step deck trailers, loading docks, or flatbed trailers. Versatile and easy to set up, these stands have an adjustable height of 18"" – 24"" and weigh just 42 lbs. each."