With built-in Torsion rubber arms, up to 90% of the inertia between truck and trailer providing a smoother and more safer ride. The tow vehicle and trailer track independently giving you greater control and added safety by reducing sway and trailer bounce. Greatly increased braking control since all the weight on the tow vehicle and trailer is distributed evenly giving you increased positive contact when braking and maneuvering. Safeguards against uncontrollable road conditions bumps, potholes, expansion joints, curves, hills, and other drivers can be a hazard, keeps you under control when confronted with these conditions.