We have the TireTraker system. When be bought it 4 years ago it was the best deal out there for a system with 10 sensors. Below are some of the features.
1. Easy to program and use.
2. "cap" type sensors to prevent air loss from the valve stem.
3. User replaceable sensor batteries, low cost too!
4. Good customer service!
5. Lifetime warranty!
Good luck, happy trails, and God bless!