I would like to share an experince I had putting air in my Trail-Air, while I was fueling up
I tried to put air in without climbing in the bed of the truck, placed air chuck on fitting
and started to fill, my foot slipped with that the threaded top snapped off. lost the air pressure, no way to fill so drove home (400 miles) deflated. called for replacement and was told it would cost $24.00 + shipping. Called local parts store for replacement $3.95
delivered, so now I travel with extra one just in case.