Well, our new coach did come from the factory with a built-in TPMS. Seems to work very well.
On our previous coach, I bought the Truck Systems Technology 507 system. It was a piece of junk as it made my tires lose air. I never used my compressor as much as when those sensors were attached to my stems. I took them off and sent them free to a guy who wanted them. A big waste of $599.
After that, I checked the tires before every departure. Never had a problem doing that and I know I could have picked up something on the road to cause a flat but those TST sensors drove me nuts.
I would also like to see a TPMS as standard equipment on RV's.
MM