^ The lengths you appear to try to go through for some things do seem strange to me, so I'll offer this. Once you figure it out, you can winterize the fresh water system and sewer tanks literally in minutes. (aside from the time it takes to drain the fresh water tank unless the drain valve is alot bigger than I've seen) And, no, you don't need to add antifreeze to the fresh water system if you do it right.
That is far better insurance than a temperature monitor and heating the camper all winter. I, and I'm sure most others with RV experience could help explain the lack of practicality of keeping a pop up TC, or most any RV that is stored outside and daily driven in sub zero weather, "wet" throughout the winter.
" I'll have 120v where it is stored." Maybe I mis understood. Thought you were clear that the camper was staying on the truck 24/7/365 and a daily driver. So stored means parked at the house?
Even easier to winterize as frequently as necessary.
