I’ve been using an aftermarket TPMS system on my trailer. It is not very elegant but I don’t mind the monitor on my dash when towing. I added the signal amplifier to ensure connection between the receiver and the wheel transmitters. So far after a small sample size of about 6k miles, has worked well.
And for the benefit of the OP’s original question, I’ve got a 20’ aluminum 10k car hauler dual axle brakes with a wood deck, just about 2,000 lbs. empty. Tows my LJ well and has room for anything else I may need to tow or some utility hauling needs.
Tymate RV Tire Pressure... https://www.amazon.com/dp/B07S7CP3PB?tag=wranglerorg-20
That's pretty similar to the one I use for my travel trailer. Works great.
