Roadmaster Active Suspension (RAS), the ultimate assist for vehicles with rear leaf spring suspension. RAS is the only suspension upgrade system that converts basic "passive" leaf springs suspension into mechanical "active" suspension. A system that instantly absorbs and dissipates load force energy resulting in significantly improved vehicle stability, balance, traction and control, with or without a load. Roadmaster Active Suspension adds critical strength to rear leaf springs, but WILL NOT compromise ride quality. The unique design eliminates bottoming out, axle wrap and wheel hop, greatly improves road handling by reducing sway and dangerous body roll when cornering, and strengthens the rear leaf springs for towing or hauling maximum loads with maximum safety. Fleet vehicles that consistently oper­ate under load will benefit from improved fuel efficiency, and extended tire life. RAS is a simple retrofit to most pickup trucks and vans with rear leaf springs, with up to a 1 1 /2 ton carrying capacity, and once in­stalled no adjustments or maintenance is ever required.