I fought the duley air problem, tried the extenders that didn't work and caused more flat tires than I really wanted. I ended up making a tire pressure checker and air inflater in one unit. The parts were availiable from CarQuest. A straight and angled air chuck, brass pipe to length, copper fittings, air guage, and an airtank inflater fitting. Assemble to fit. The 98. 5 wheels and trim seem to be different from other wheels. I can check the pressure and inflate or deflate any of tires using a standard air hose at any air supply.