It doesn't get as cold here in Texas, but it does get cold enough for water to freeze, so here is what I do.
First I made a little device that connects to a quick disconnect air fitting on one end, has a pressure regulator in the middle, and a male garden hose fitting on the other end. I set the pressure at thirty pounds, and hook that contraption to the water inlet. I use the compressed air from the bus for supply. I make two complete rounds through the coach running water from each outlet until very little water is blown out. Make sure you do the frig and washer too.
Then I pour the pink antifreeze in sinks, tub, and potty to keep the traps from freezing.
I use the manual disconnect switch on the house batteries.
Takes about 15 minutes.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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