Air Lift LoadLifter 7500XL Air Spring Kits are air bag/air spring kits that are designed to easily and affordably keep your vehicle level and your ride quality smooth regardless of what youre hauling, or the quality of roads you are driving on. This means better braking, steering, headlight aim, reduced sway and bottoming out. When carrying a heavy load, simply add some air to the Air Lift springs/bags, and that sagging load is now level. Simply remove the air when youre done hauling (takes seconds), to return to normal ride height. The Air Lift LoadLifter 7500XL Kit features massive 7-inch double-bellows air springs that offer far superior performance and strength, particularly at low pressures that are a weak point of smaller air springs. The LoadLifter 7500XL Air Springs hold 20% more volume than LoadLifter 5000 Air Springs, meaning lower air pressured and superior ride quality. Each LoadLifter 7500XL kit also includes Air Lift's exclusive upper and lower roll plates. These plates increase your load capacity by 10% and protect the air springs from sharp edges,like brackets and your vehicle's frame, ensuring the lifespan of your air springs. When you order your Air Lift LoadLifter 7500XL Air Spring Kit, youll receive everything you need to install the kit on your vehicle. No additional parts are required. You can expect to spend an hour or less installing your new Air Lift LoadLifter 7500XL Air Spring Kit. All brackets, air lines, fittings, hardware, and instructions are included. Some users choose to purchase the Air Lift On Board Compressor (sold separately on our website as an optional accessory), so their vehicle levels automatically. The part number for this Air Lift LoadLifter 7500XL Air Spring Kit is 57538 and it fits 2011-2017 Chevy Silverado GMC Sierra 2500HD, 3500 (4WD Models).