Be aware that pass-through sensors are much larger and heavier than standard sensors and you still have to have a valve cap. There is no difference removing a sensor to removing a valve cap so, in my opinion, pass-through sensors provide no benefit whatsoever.
The biggest selling system for RVs is sold under three major brands, Tire Tracker, Tire Minder and InnoTechRV. InnoTechRV.com generally have the best prices and best service.