Rear Air Suspension Spring Bag Kit 5000lbs Fit for Toyota Tundra 07-21. Load Capacity: 5000 lbs up. Can deliver superior load-carrying capacity. Can prevent body roll and bottoming out while towing heavy loads. Keep proper ride height. Replace your factory jounce bumper. Reduce bouncing at the rear of vehicle when towing. Stop vehicle’s main springs from sagging (due to constant load compression). When towing / hauling heavy loads, air springs raise safety /comfort working with your suspension. Two adjustable secondary air helper springs can add up to 5,000 pounds of leveling capacity per axle for vehicles with leaf springs. Instructions Are Not Included. We Recommend Professional Installation. Other items you might also like. Established in 2006, maXpeedingrods has been engaged in the research of over world racing products and culture. It has strong capability of independent research & development, industry-leading capacity of quality control and perfect logistics and after-sales service system. MaXpeedingrods always follow the development concept that “Success derives from devotion and happiness comes from sharing” to make contributes to domestic and overseas car tuning enthusiasts and the global racing culture by excellent products and service. MaXpeedingrods has a longstanding commitment to the research of ECU, engine, gearbox and vehicle performance electronic calibration. We established cooperations with EMtron, Motec, LINK, Cartek, HiM, etc. MaXpeedingrods owns its warehouses and branch offices in Hongkong, United States, Australia, United Kingdom and Germany.