How many of you guys have or do not have a TPMS?

I don't. Class C, no toad. I bought one a few years ago and used if for a while. It ended up being more of a pain that I thought it was worth (having to reprogram unit, not reading current pressure at startup).

Instead I keep the rig well within weight limits and buy good tires.

Maybe I just had a bad TPMS, but I can't bring myself to even pull it out of the drawer and try again.