Winterizing tips for living in RV, in frigid climate?

X2 on heat and insulate underneath. Ground cover and straw bales all the way around. With respect to using wood. You can have an outdoor wood burner and pipe heat into motorhome. This is really not a great idea and is going to take a lot of survival techniques. Sleep with the dogs. I would drain everything and use bottled water and a porta potty so that problem is gone. Good luck.