Improved travelling comfort for levelling with onesided loading to upgrade the travelling comfort with older vehicles. Larger spring stiffness, manual external air supply. Manual levelling 2-circle system will be delivered on desired level by external air supply by compressor or at the gas station. Air bellows on the left of or right can be supplied independently with the necessary air pressure. Lift - function changing of chassis clearance and the rear angle of driving slope by compressor or at the gas station. Lift for easier loading and unloading around max. 5 cm possibly. This is only possible in passive state. While driving the pressure must be adapted in regards to the suspension comfort according to specifications. Service affability, maintenance-free air suspension system, area-wide net of service.