Which Manufacturers make a true 4 season class A ?

I have been in some cold temps with a variety of motorhomes. Coverings on windows, light bulbs in wet bays, prudent use of slides (bring in a night and when away) and good supply of propane will allow comfortable winter camping. I use my dash/cabin heat and AC to supplement coach. 15 minutes of heat or air will really help the coach systems and bring comfort to the front of the coach and at no more cost than running the generator. In 100 degree heat the dash AC can really make a difference in comfort when run for short time and the same for heat in cold temps. We use the front seats so that is important. When I have winter camped for a few days shoveling snow to meet the sides and shelter the underside makes a huge difference. The snow does insulate. Easier than hauling straw bales. My point is if you can't afford one of those well equipped for winter coaches you don't need to stay home.