Living in class A

I am a fulltimer, currently parked in the very cold and snowy northeast!! I have heat tape running along the water hose, with the pipe insulation over that. works great. But, I do keep my fresh tank full, so on the outside chance I don't have city water, still ok. Is your basement heated with the furnace? I have a blower that sends heat to the wet bay, never had a problem - I supplement the furnace heat with a small electric heater. Like you I have a "t" on my propane - much easier to swap out aux tanks than move the rig. Try to keep your slide toppers free of snow or water - that stuff will melt then freeze and could cause problems if you need to bring them in. I bring the slides in for big snow storms, for rain - then night time freeze - I run the slide in to dump excess water on the topper. An electric mattress pad warmer or blanket is nice for sleeping. If you have condensation, you will have to crack a window.