Adjustable Air Springs From 5-100 PSI With Up To 5;000 Lbs Of Leveling Capacity. Levels Your Vehicle When Towing Or Hauling For A Safe; Comfortable Ride. Helps Eliminate Vehicle Sag And Bottoming Out. Easy To Install With Included Instructions. Underframe Kit Designed To Work With Most In-Bed Hitches. No Frame Drilling Required. Internal Jounce Bumper Absorbs Shock And Can Safely Run With Zero PSI. Features Air Lifts And 60-Day Ride Satisfaction . Air Spring Cradles Allow The Vehicle To Maintain Full Suspension Extension. Do Not Exceed The Vehicles Gross Vehicle Weight Rating (GVWR).