Even if temps drop into the mid/upper 20's, no way will holding tanks freeze in just a few hours of sub-freezing temps. I expect most of your water lines are inside - just keep cabinet doors open at night when the heater is on - warm days solve cold nights. ST
Two and a Hound in a 2015 Prism "B+", pushed by a 2021 Chevy Equinox.
1st 50 done, working on the 2nd pass! Somewhere over 150k miles to date
2005-2015 Roadtrek 190P, 1993-2005 Northstar Soft-Side TC, 1989-1993 Tents!