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  1. I have a 5th wheel and a 2022 GMC 3500 as tow vehicle and the truck came with 4 GMC tire pressure monitors for trailer use (sensor shown below). I took the Rv to a Rv tire repair shop and they said the GMC tpms valves are the incorrect diameter (11.5 mm / TR 11) and the stems in the 5th wheel Cooper wheels are 16mm (TR 15) diameter. I called gmc and they couldn’t find a 16mm stem tpms kit. I have searched online and there are 11.5 mm to 16mm grommets (nylon) that seem to be aimed at bicycle industry. Not sure what my solution is if I want to add tpms to my 5th wheel. Any thoughts?
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