Factory suspensions must compromise between ride comfort and handling capacity. Smooth ride suspensions can't carry heavy loads and heavy springs ride rough when the vehicle is unloaded. Air adjustable springs solve these problems and give a safe, comfortable ride under all road conditions. Super Duty handles big loads up to 5,000* lb. of full time load leveling and support. For front or rear leaf springs on motorhomes, 1 ton trucks, vans, SUVs and other vehicles carrying or towing heavy loads. Includes air springs, brackets, lines and connectors. See us for specific fit applications. Price each. *Never exceed manufacturer's recommended gross vehicle weight rating.