I use Tire Man solid brass extenders. Just installed, today, the Tire Tracker TT-500 TPMS. Easy install. Quick test ride and it appears to work great! I purchased the 10 sensor set: 6 for motorhome, 2 for tow dolly, and 2 for toad or boat, depending on which is being towed.
Will be towing boat so 8 will be in use next week for a 800 mile trip.
Time will tell how long they last and how reliable they are. Lifetime warranty.