Offering up to 1,000 pounds of load-leveling capacity, Air Lifts flagship kit, the Air Lift 1000, will make towing and hauling with the 2010-2021 Toyota 4Runner 4WD and Lexus GX460 a comfortable and stress-free experience. For frequent use, our fully-adjustable, industry leading air springs are the perfect partner for your vehicle, eliminating any issues that you might face. The Air Lift 1000 system fits easily into the rear coil springs of the vehicle providing suspension support. Easily adding air when carrying heavy loads will keep the vehicle level and stable. Adding air bags helps to eliminate problems frequently faced when towing and hauling, such as squat, poor headlight aim, trailer sway, body roll, and bottoming out. With the added stability and weight-distribution that air springs provide, you can haul safely, knowing that you have optimal braking and steering control. The air springs are adjustable from 5-35 PSI, ensuring that your vehicle can be ready for any weight and any situation. Simply add air when towing or hauling and deflate when riding empty. As the leader in air suspension products for over 70 years, Air Lift is committed to delivering quality load support parts that last. To ensure the highest quality, longevity, and customer satisfaction, the key suspension components, including the air springs and all hardware, have all been torture-tested to 1 million cycles on our hydraulic test rig. With a lifetime warranty and 60-Day Ride Satisfaction Guarantee, not to mention the Air Lift reputation for great customer service and technical support, should you run into any snags in the installation process, you can purchase this kit with peace of mind. Installing the kit is a simple process, requiring only common hand tools and no frame drilling, specifically designed to be installed in 2 hours or less. The Air Lift 1000 kit comes with a fully-illustrated, user-friendly installation manual, making the install process easy.