Imo, i think a truck camper would be your better option.
Winnebago has a new 4x4 Ford transit that you could look into.
I now have a class c 24’ with two QB’s.
I have no idea how cold you could really use it with water, i have been down to 20F with it.
My Ford E450 2018 has a limited slip rear , no 4x4. Would need a Quigley conversion.
Sunseeker 2350
All the water lines are within the heated cabin .
It has heated pads on the holding tanks.
It has a heat duct directly on the water pump.
The freshwater tank is under the corner QB.
The shower head , lines and valve are located on a heated interior wall.
The heat gets under both sink cabinets.
I have tested all those mentioned areas using a thermometer.
