The Center Point air-ride suspension system from Lippert is designed to dampen road shock more effectively than torsion axles, giving you a smoother, more comfortable ride while towing your RV. By absorbing road shock, the Center Point can also help prevent damage to your RV and your cargo that can be caused by the impact of trailer movement. Our replacement air suspension kit is for 6,000 to 8,000-lb. tandem trailer axles with double-eye springs.