I'm thinking about buying a TPMS system for my toy hauler. I don't want to jump into it blindly though, because the systems aren't cheap and I'll have to pay a few extra bucks to have my rubber valve...
I have been using the Tire Minder system for more than 5 years and have had no problems with it. The new systems come with a signal booster, which I added to mine to increase the signal strength.
