Maybe it is just the newer GMC’s, I have tried various extensions, TST – I have had metal stems of multiple sizes and angles and can not find any that work. I seemed to always develop more serious leaks with any of the add on’s. I now have tire pressure sensors that are mounted in the tire on the inside of the valve stem. This is working well but I have to go to Discount Tire to have air added. I may try and get a tire tool so I can take off and replace the decorative cover on the wheels. I believe with this cover off I can get to the inside valve stem.
Marshall & Nancy
2013 Elite Suites 38RESB3
2011 GMC Sierra 3500 HD DRW 4WD Duramax
Solar 880 Watts, 24V