Geoff, there are trailer TPMS kits from Dill and others. I have a Dill one that uses OEM style TPMS sensors (bolt in like ours) vs. ones that screw on the end of the valve stem that I don't trust. My kit can be 1 to 10 sensors. I have it with six - four road wheels and two spares. Shows temperature and pressure for each.
Of course, it won't catch a sudden blow out or delam always, but, the last flat I had, it warned me in enough time to slow down and pull off the road into a parking lot.
I throw the tires in the car or drive to events on the tires I'm running 90% of the time, but, when I do tow, I like have the trailer tire info.
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