Brands that are well built for winter??

There is not a trailer on the market nor has there ever been that will handle 10 or 20 below 0 temp. I've survived in them but it wasn't easy. Between sewer & water trying to freeze and running furnace full time plus 2 electric heaters full time, frost build up inside and bedding & clothes freezing to the walls, it is a chore. Maybe if you just experiance these kinds of temp for a few days you'll get by. Do it for 3 winters in a row all winter long and see how well it works. I've done it. Artic Fox is the closest you can get to a 4 season trailer. Wish I could afford one. It still would not be ideal or fun, believe me.