We've had an Okanagan 90W for a few years and have had no troubles at all. It's built very well and the insulation in the walls seems to be excellent. Unfortunately, we only have single pane windows so they're cold in the winter, but there's no leakage around the edges. If the camper you're looking at doesn't have a generator, you may not be able to add one. Okanagan used Generac, and they're no longer made and there don't seem to be any used ones anywhere. Ones you buy today probably won't fit. It's a great camper for boondocking since the freshwater tank I. Ours holds 54 gallons, with black and grey tanks very large as well.