Class As in cold weather?

We use our gasser almost exclusively in the Winter out West. We spent many nights below zero in the mountains. We always took chains because you never knew when a snow storm would pop up. We also hooked up to shore water only to keep our water tank topped off. We only hooked up to the sewer to dump our tanks. In the wet basement compartment we put in a thermostatically controlled 150 watt incandescent light bulb installed in a trouble light wire cage. We disconnected and removed the ice maker hose. We never had the RV water pump or a water line freeze. Inside we used our furnace very seldom since a couple of 5000 watt space heaters were sufficient in all but the coolest temps. We also carried a portable heat pump that we vented to the outside, which was quiet and worked well to keep things comfortable in below zero temps. A portable 120 volt heat pump is never exposed to the outside temps so they will work at below zero temps. We also used small fans to blow on the windshield to keep it from frosting up. The other windows were double pane which helped keep the interior warm. I believe with proper preparation and with some limitations most any RV is usable during the Winter months.