The Air Lift 7500 XL Ultimate kit offers maximum load-leveling power for your Silverado or Sierra 3500—engineered for confidence comfort and control. Our fully adjustable air springs are the perfect upgrade for your vehicle and work to eliminate issues when towing and hauling like squat poor headlight aim trailer sway body roll and bottoming out. The kit’s pair of massive 7-inch double-convoluted bellows air springs allow for greater leveling abilities at lower air pressures than similar systems keeping your cargo safe and secure while ensuring a comfortable ride. As the leader in air suspension products for over 75 years Air Lift is committed to delivering quality load support parts that last. The key suspension components have all been torture-tested to ensure quality longevity and customer satisfaction. With a lifetime warranty and a 60-day ride satisfaction guarantee you can buy this kit with peace of mind.