The RAS RoadActive Suspension rear leaf spring upgrade is the only suspension upgrade that improves towing and hauling performance without stiffening your unloaded ride. Unlike traditional add-ons, RAS works with and strengthens factory leaf springs by 40-50%, eliminating squat, reducing bounce, and increasing stability for better driver control. This mechanically active system works instantly to support your truck's suspension, maintaining proper leaf spring arch while absorbing and dissipating load force energy. No adjustments, no maintenance—just install and enjoy a smoother, more stable ride.