I have a Tyre Dog TPMS with internal sensors ( replaces the air valve) and they have been great, 50,000km with them an no problems and they have given me warning of slow leaks twice.
I had the external tyre sensor on my Discovery, and they only lasted one serious trip (about 10,000km) before one by one the sensor started to fail. Like others have found, corrugations and rubber valve stems allow them to flex, and the sensor wore the paint off the rim. It was during the Birdsville floods 2010 when we went down the Birdsville track just after they opened the roads to let everyone out and they probably spent quite a bit of time under water which could have been part of the problem.
I have this system for my Unimog, Steelmate Australia & NZ- TPMS, Parking Sensor Specialist which works with the monitors in the overhead console. I would love to have internal sensors, but I have internal beadlocks (Staun ones).






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