In your holding tanks, you can accumulate a fair amount of water - 20, 30 gallons. It can take a lot of anti-freeze to keep that from freezing (depending of course on temperature, insulation, heat source, etc.). My suggestion - leave the gray water tank open, leave the black water tank open (and use campground facilities for solid waste disposal). Don't leave the black tank open and us it for solid waste.
There are heated water hoses which will assure you of a water supply.
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