Roadmaster active suspension helper springs are a great help when towing heavy loads. With Roadmaster active suspension installed, the factory leaf springs are supported in their optimum bowed posing and can absorb the additional load forces from driving conditions. The prevent bottoming out and allows the vehicle to carry loads with less sagging and much greater contact of all four tires to the road at all times. Reduces sway when cornering and prevents the rear wheels from "tucking" resulting in better handling. And unlike air bag systems, the Roadmaster system never needs any adjustment or maintenance. No drilling, cutting, or welding is needed for installation. Installation available at an additional $120 charge.