I have had three
Bigfoot trailers, all 4-season. As noted in an earlier reply to this thread, just look for the model number. Anything designated as a 2500 model is 4-season, the 1500 model is not. There are no 1500 models currently being manufactured, but there are used ones around. Trying to upgrade to four season is likely not feasible, other than replacing the
windows with double pane. The most important feature of the four season is that the tanks are enclosed and insulated with ducted heat from the
furnace routed to them and to interior plumbing. You water system is fully operational and protected as long as you keep the
furnace going. I have camped in my Bigfoots well below zero F and the system works.
Bigfoot would be a great choice for full-timing in winter conditions. There are a lot of people living in RVs in the North Dakota oil patch right now. Those without 4-season RVs are putting a lot of skirting underneath and using big heaters to keep the tanks from freezing.