We have the TST503 system on a 272UFL Outback. I haven't had to use the range extender that came with it. We had rubber valve stems with no problems over 10,000 miles of travel.
But you've given me an idea about having the wheels balanced with the sensors on. Next camping season, our TT is going to be treated to a new set of boots and I'll defintely be asking the tire people for metal stems and balance with the sensors on.
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