Prime Design's all aluminum AluRack cargo carrier provides support for loads, long or short, up to 300 lbs. with five heavy duty reinforced extruded cross supports. Full-length side rails made of .080 thick aluminum tube help protect cargo and keep it on the rack. For convenience add a quick clamp upgrade to either the street or curbside of the rack. A quick turn of the handle releases the clamp and your ladder can be easily removed.