I have camped a few times in single digits over night. The water line going under my shower to the toilet would freeze at this temperature. There is a plastic cover over the shower pan that you should remove so warm air can get into that area. I have also added a few more heating pads to the elbows and black and grey tanks and also the valve box enclosure. I burst a black sewer line from the black tank to the valve box on that cold trip so i learned my lesson.
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