Below is TST's July 10, 2020 response to my question about Flow-through vs Cap Sensor and valve stem type.
You may keep the rubber valve stems if you use the RV cap style sensors. If you choose the flow through sensors, you will need to change them to metal stems. Keep in mind that the flow through sensors are about 1 3/4” long, so you must also have deeper wheel wells so they do not stick out too far from the tire.
I received my new in box TST-507-10RV yesterday. Page 1 of the Installation Manual states
Cap and Flow-through sensor batteries last approximately one (1) year.
2020 Coachmen Galleria 24A