tire pressure monitors

I have had the TST 10 tire system for over a year now. I can attest to the sensors durability. I had a tire on my tandem axle car trailer come apart, rubber everywhere. While the tire was disintegrating it appears that some of it slapped the tire next to it and broke off that tires valve stem and the sensor went flying down the road at 55mph. While I was changing the two tires the wife went looking for the missing sensor. She found it and the plastic cap that broke off it. When we got home I glued the cap on and the sensor still works fine.
Note that you should use very short and or metal valve stems with the sensors. I started with standard rubber valve stems on the trailer and found that they were banging the wheels, probably caused from centrifugal force and bumps.