An air bag suspension supplies a smoother ride and is fully adjustable, permitting drivers to tweak each and every wheel's air pressure individually and even tilt the vehicle side to side or front to back to level it out. The air cushion softens the contact between the axle and the frame to lessen bottoming out, and they provide between 500 - 5,000 lbs of load-leveling capacity depending on your vehicle and the kind of air suspension you get.