Some P92 chassis are equipped with air suspension which provides the vehicle with a smooth ride and the proper ride height regardless of any changes in the distribution of the weight in the coach. Air suspension systems differ from conventional steel leaf spring systems in the way that the air suspension systems are able to maintain ride quality.

Steel leaf springs feature varying spring rates so that as the vehicle is loaded and the spring deflects, the suspension become stiffer. The outcome is a rough ride which will lead to premature suspension wear as well as a lack of comfort to the vehicle operator and the passengers. Air springs have a constant spring rate over a greater amount of travel (deflection). In addition, air suspension uses ping tanks in order to help absorb road shock and to provide passengers with a smoother ride.

Air suspension is also designed to maintain the most desirable ride height. This is controlled by three pneumatic height control valves; one on the front axle and one at each rear trailing arm. Steel leaf springs are not able to control the ride height.