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; Does not fit the Powerboost Models; No frame drilling required; Eliminate sag and bottoming out; Rugged durable components including air springs and all hardware; Easy to install with included instructions; Up to 5000 pounds of leveling capacity; Underframe kit designed to work with most in-bed hitches; Features Air Lifts Lifetime Warranty with a 60 Day Ride Satisfaction Guarantee; No-drill design but requires a cutting tool such as a hacksaw or grinder.