I am planning to put in some rigid foam insulation with soft weather stripping on the bottom of both sides of my water compartment and put aluminum foil, heat tape and round pipe insulation on the water hose. I planning to dump sewer / grey water as needed.
I stayed in Steamboat and Vail in December and had no problems with freezing plumbing inside the coach with 1 space heater in the compartment opposite from water manifold. I had my pump freeze once, so I just repointed the space heater to blow towards the pump and it never happened again.
I purchased 2 X 200 Watt space heaters in Target and will use them instead of one I used in the December, as 1 X 1500 Watt at the lowest setting was heating up my water compartment to 80+ degrees.
I did have an issue with water manifold freezing while driving in single digit temps, but I latter discovered that I had small outlet (for drinking water hose) opened. So I will put the insulation on the floor here and permanently mount that small space heater.
Taking a trip to Aspen later this month so I can update how these small mods will pan out.
Alex and Valerie
2014 Berkshire 400BH