After looking, reading and trying to understand - we decide on the TST 507RV TPMS. Lots of reason but the active ongoing dialogue with the owner on various sites of the course of several years convinced me that this business is here for awhile and understands it's product.
To make sure I got the right system I ordered from Great RV Products. This small business is owned by an RVer that cares. AND the will match the best price on the internet.
Not having something like this is ignoring the largest and most important safety item on your coach.
Here is the Great RV Link - TST Tire Pressure Monitoring Systems
All the best.