Tandem axle system absorbs impact caused by road shock and provides a smoother ride, reduces side-to-side trailer sway plus provides optimum braking efficiency. Airbag absorbs road shock and vibration from both axles simultaneously and without delay. Dampens road shock more effectively than torsion axles. Protects your RV and cargo against damage. Dramatically improves braking distance in panic stops. Easy to install and dramatically improves passenger comfort. | Lippert Center Point Air Ride Trailer Suspension System