We have been using the TireMinder system on our trailer truck camper since 2015 and it works very well. even avoided a lot of damage when we punctured a trailer tire with a large piece of rebar the first year. Earlier this year we traded in a 1 ton truck with two rear wheels and ordered six new sensors for the truck. The system was working well until a transmitter broke this week. I just got off the phone with MinderResearch. They were very easy to deal with and today a replacement sensor is being sent under warranty. We'll stick with the TireMinder system as long as it's with us!