4 season totally depends where you live....Northern States and into Canada...forget it...no such thing! Condensation is a real issue...walls are too thin, open space under the floor causing floor to be cold at all times, and then issues with freezing water and drains. Our last trip before winterizing, we were camped in temps that went down to 29-30 at night and just barely got past 45 in the daytime. We burned through a 30lb propane tank in 3 days, so a bit colder and you will go through a tank of propane every couple days.
2011 GMC Sierra 2500HD
2014 Rockwood 8289WS, Diamond Pkg.