'71 Starcraft Wanderstar- "The Hilton"

wickedfun wrote:
I'm wondering about the drain pipe, its graded and unless it is both plugged and full it should have a place to expand and not split, I thinking insulate yes, heat tape maybe not, it could be a good place to simplify.

I can see where you're coming from on the pipe but in this case, the pipe is filled to the dump valve. I'm afraid that if I don't offer a bit of auxiliary heat, the pipe may freeze and split. If I could, I'd extend the insulated enclosure right out to the end of the 3" drain pipe but I have the auxiliary 2" valves that control grey water flow to the black tank and the drain outlet that need to remain operable in that space. I could replace them with cable assemblies but what would I be able to do if replacement was necessary and they were enclosed?
Tomorrow, I'll get some pictures up of the waste tank and piping so that better reference can be made. Thanks for your input, it is sometimes only a small spark that is needed to light the fire.