2003-2011 Dodge Ram 2500 and 3500, single and dual rear wheel, 4WD does not fit cab and chassis.LoadLifter 5000 kits are Air Lift's heaviest rated air spring kits and provide up to 5000 pounds of leveling capacity*. Rugged and durable, LoadLifter 5000 air springs are constructed like a tire from ultra high-strength composite nylon and reinforced 2-ply fabric. They're strong as steel, but lighter and corrosion proof. Air Lift air springs fit inside your leaf suspension to provide load support when you need it. The air springs are fully adjustable from 5 to 100 PSI. Inflate and deflate using included Schrader valve. For optimal convenience, add an Air Lift On-Board Air Compressor system. Inflate your air springs when carrying a heavy load to ensure weight is properly distributed to all four tires. Deflate when riding empty. A level, stable vehicle means better braking, steering and headlight aim. It also reduces sway, porposing and bottoming out. Each LoadLifter 5000 kit 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. Our Lifetime Warranty covers the air springs, fittings and all mounting hardware€”other companies cover only the air springs. We also offer a 60 day No Questions Asked Money Back Guarantee. Easy to install in less than 2 hours. Full installation instructions included. An installation video is available on our website. *Never exceed the manufacturer's recommendation.