Oh the joys of winter camper camping. Its not easy on your equipment or you! I would recommend Phoenix Pop Up Campers because they will make you what you need! There manual load bar lifting mechanism is superior for snow loads. I spend roughly 100 plus nights per year in my Phoenix pop up camper. This is my second camper from them…. first one was on a Tacoma. It has extra insulation everywhere and a 20,000 btu furnace. I have no issues staying in it to -40 C or in heavy snow conditions except for water and snow load on roof can make it tricky to put up or take down with a foot or so of wet snow (manual lift bars). Facilities and showering are more troublesome.
Now having said that my experience is a very good one due to Phoenix made some upgrades to my camper such as the heater, cassette toilet system, accessible under-bed storage without the top up, insulated lines with heat tape, extra insulation in camper walls & floor, extra insulation in the roof and pop up, 30 Lb propane tank, Rhino-lined interior floor to easily clean up the snow, generator, two 6 V batteries and solar panels to keep the heater fan blowing.
How I solved my issues:
I do not run the water pump or fill the in-camper water tank in the winter. That pesky direct heat/tank less water heater stopped working regardless…. after replacing three of them and the latest conking out this winter. I have not got around to adding a hot water intake line cut off. Now I use a Scepter 20 L can with a manual pump that fits on the pour spout. I actually like this because its simplicity and I can keep the water cans in the cab of the truck to insure they don't freeze while I'm travelling (it's a 4 door Tundra). My cassette toilet is used rarely as I'm generally in the bush and use the bush, or on a ski hill I use the facilities available during the day. I mix in RV anti-freeze in with the cassette toilets water for flushing or pour some water/RV anti freeze into the bowl of the toilet and it works as required and I can still pour out the contents when I get to sani. dump or a toilet to pour it out. For showering I use a Hot Juggz shower system and homemade bio-degradable eco-friendly type soap and let the tank drain into another 20 L scepter or onto the ground depending where I'm at. I can get roughly 2 showers out of/into a 20 L can.
I keep a collapsible snow rake I bought from Costco in my under-bed storage.
You get lots of condensation so wiping down camper many times a day is required as well as running de-humidifier such as a Dri-Z.....no way around this.
Now maybe it doesn't sound like much but those few changes make a world of difference if you plan on using a pop up camper year-round.
Good luck and get out there!