The weight of the sensor (less than an ounce) is insignificant on a large motorhome tire, especially those with metal valves. I have heard (second hand) of the occasional problem with passenger car tires using rubber valves stems, but have not seen that myself. I've run two different coaches and two different cars with PP installed, a combined total of over 150k miles with no problems.
I believe, however, that PP recommends using metal valve stems wherever possible. It's the safest way.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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