I answered my own question above by reading the FAQ on the TST website -
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Do I need special valve stems?
No, you do not need special valve stems, but you do need commonly available metal valve stems.
The added weight of the sensor on a rubber valve stem could cause problems that will be avoided by using metal valve stems.
Most motorhomes and commercial transport vehicles come equipped with metal valve stems. If you do need metal valve stems, they are not expensive; a recent customer had 6 valve stems replaced on a 30’ gooseneck racing trailer for $36. They are available and can be quickly installed by any tire dealer.
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So if I install them, that would be a good time to get all 4 tires balanced as well.
