Linda,
I found this thread on the Doran TPMS:
http://www.trailmanorowners.com/foru...ighlight=doran
1 member did have a problem with the signal to the reciever, but his unit was mounted low on the dash. I have mine on top of the dash, and no problems. And I did get metal valve stems installed when I got my new tires, plus I had them balance the tires with the sensors in place.
Hope this and the previous post and website help with understanding another complicated angle of RV ownership, and how to spend more money.
Chap