AIR SUSPENSION SEAT. 12 VOLT ONLY. (SHOWN WITH OPTIONAL HEADREST $201.30 AND ARMRESTS $217.80 PAIR) Maximum seating comfort. The pneumatical suspension of the MAXIMO L was designed for medium-sized and heavy tractors. It works by absorbing most vertical vibrations and jolts. This way, the driver keeps relaxed and comfortable - staying fit longer while keeping the vehicle fully under control at all times.