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We have been going to AZ for several years and have run into some temps that have dropped below freezing. I carry three things with us when heading South-- a 10-15 ft heat tape, some foam pipe insulation, and some duct tape. If we know it will be a few days and the temps will be down below freezing, I wrap the heat tape around the city water hose, take the foam insulation and put that around the heat tape and hose and duct tape it on. This holds us over the nights and as some have said the temps normally warm up during the day. If it will be dropping below freezing for just over night, I just put some water in the fresh water tank, disconnect the city hookup and run off the fresh water tank or use the gallon jug procedure mentioned above. If I was setting up in a cold area for the winter I more than likely would purchase a heated hose but actually they are the same as what I do with the heat tape and insulation so not actual need for it.
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