The fresh water tank is under the master bed with a heater hose right next to it. And the grey water is under the Shower with another heater hose and heater just on the other side of the wall so at 30 you shouldn’t freeze. That being said if you are just going over night and in a camp ground that has the facilities open I wouldn’t do all the work just for one night. I would just use the campground bathrooms
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