Air springs fully adjustable from 5-100 PSI helping to level your vehicle when towing or hauling a heavy load for a safe comfortable ride with no sag or bottoming out; No frame drilling required. No-drill design but requires a cutting tool such as a hacksaw or grinder.; Internal jounce bumper absorbs shock; Rugged durable components including air springs and all hardware; Easy to install with included instructions; Up to 5000 pounds of leveling capacity. Do not exceed vehicle’s gross vehicle weight rating (GVWR).; Under frame kit designed to work with most in-bed hitches; Features Air Lifts Lifetime Warranty and 60 Day Ride Satisfaction Guarantee; Does not fit Powerboost models