I'm not sure how that system operates, but in the Ford TPMS system, all the wheel sensors have a motion switch and a time delay. After a set time (I think 2 minutes) the sensors turn off unless there is motion on the sensor. To me, that means that the sensor doesn't send "new information" until after the vehicle is moving again. You may want to do some double checking to see if that's the same with your sensors. If it is, then what you get once the system boots up is the "last known sensor output" until the sensor is reactivated. That could lead to a "false good reading" if you just hook up the RV and check pressure with the TPMS rather than a tire pressure guage.
Maybe I'm off base on your system, I am not familiar with it, but the battery in the sensor most likely couldn't stay powered on "forever" or it would run down to quickly to be functional for any great length of time.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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