We're in Alaska and are finding it difficult to avoid rock chips using the Rock Tamers. We had mud flaps/splash guards installed on the truck along with the Rock Tamers hoping for additional insurance, but chipping happened and we'll deal with it once we get home.
But, we're having the time of our lives.
Dave
several of the manufacturers push their wares on YouTube.
Some have more features than others. I have learned that in the past I have bought things with more features/costs than others. The videos may help you decide what you want. I personally like the features of the ones that go to sleep when not in motion, the unit locks on the valve stem and the unit has a big display.
Below is a great article from RV Life magazine regarding TPMS systems
http://rvlife.com/stop-blowouts-monitoring-rv-tires/