Originally Posted by BB 55 Bubble
.... There is a pipe that is designed to handle the stress of freezing with out bursting...
Hi and welcome to the forums. Minus 20 degress farenheit is pretty cold.
The non-bursting pipe wouldn't solve your problem because when you wake up in the morning you wouldn't have water anyway and might as well carry portable tanks. I'm thinking that winterizing is still the best solution.
It sounds like you don't want to run the heater at night. I might suggest that you add a fan to the floor and ventilate. But I suppose that you have fiberglass insulation down there and you wouldn't want to blow that all around. Also, I don't think that heat tape is feasible to run on battery power due to the power required. Using the flexible plastic pipe would it be possible to replumb the camper with pipes above the floor? Then do you have to worry about the black tank?
I'll be interested to see what solutions are offered.
Best of luck,