This pair of heavy-duty coil springs is designed to provide a 35% increase in load handling capability over the vehicle's nominal spring rate, and offer an easy upgrade for vehicles used in continuous heavy hauling conditions. Custom-engineered to improve ride quality, reduce driver fatigue, and improve handling, they're an ideal replacement for coil springs on many pickup trucks, SUVs, RVs, plow trucks, vans and more. Need even stouter coil springs? Check out the our extra-heavy-duty version of this spring set that provides a 70% increase in load handling capability over your truck's nominal spring rate.