I have a Bigfoot and love it for winter camping. I use it full time in the winter for my job in Southeast Alaska. We don't get as cool as the Dakota's but I have stayed a week at a time in -20. One year with no propane heater as it gave up the ghost just as I started a job. I stayed warm enough with an electric heat but it wasn't above 40 degrees in the camper. I was plugged in. I only have single pane windows which I plan on upgrading one of these years. I covered them with reflexit and then seal with plastic. The week that the heater went out I also put the blankets over the windows. Worked pretty good. I take the doors off the cabinets under the sink to keep the pipes warmer. In the toilet and the other drains I put RV antifreeze most night if I have used the plumbing. I drain the plumbing when it is below Zero.
