Pacbrake HP10171 Rear Air Suspension Kit The strongest air springs on the market for 2011-2014 Chevy/GMC 2500/3500 2WD/4WD Pick-Up trucks (with or without 5th Wheel Hitches) No drilling (on vehicles without a 5th wheel hitch) Reinforced Aluminum End Caps  Anodized for corrosion resistance 18 Support Wires & 2 Ply Rubber - For extra durability & added strength Lifetime Warranty