I use our 3055RL for staying in while working out of town, winter months included. I use a self regulating heat tape on the fresh hose connecting to the unit. I have 2 layers of 4ft long pipe insulation over the hose until hose is covered fully then wraped with black ductape so it will soak up some sunlight. I have had different brands of campers and so far they have all had hose off the furnance going to the holding tanks and blowing on them. I took my bottom off and put 1 inch foil back on bottom of floor and side of frame as to increase the R- value. I also put some more fiberglass lightly up the rear bumper if you will call it. This area going to tail lights was very thin on insulation, I could stick my hand up the rear wall and feel almost no insulation. I then took the basement storage walls out to access the wiring, hot water heater I attached 1 inch foil to the walls there to as well as used fiberglass lightly under the stairs around hotwater heater. Then also I used several cans of spray foam insulationto seal up the underbelly and holes in the frame. This has worked very well for me.