After a few minutes of checking, seems a larger camper needs a repeater aka booster. I don't feel like swapping to metal valve stems and these sensors can be used on rubber valve stems. I guess the repeater aka booster would go up into the front compartment where the landing gear and battery is on my camper. There is only the composition door between it and the truck. Same package is available on amazon at the same price. Whatcha think?
https://www.etrailer.com/TPMS-Sensor...er/TM89FR.html
I wondered why folks talked about theft deterring features on the sensors and a pair of extra sensors is about $80 on etrailer.com so if I wanted to add them for my truck at some point $160 more but doubt I will go there right now.