RoadActive Suspension kit includes an easy to install RAS Spring for each rear leaf spring. RoadActive Suspension kits are designed to strengthen the rear leaf springs for towing or hauling while providing same-as or better-than-stock unloaded ride and performance. This 3-in-1 solution works like a helper spring, sway bar and traction bar, at 1/3 the price. Fit-and-forget it install time is approximately one hour.