Dog Rescuer, yes, it is possible to transplant from Flahdah to Montana. However, you may need a blood thickener if you transplant during the colder months. I would recommend moving during the warm months, thereby acclimatizing your body gradually instead of an instant shock to the system.
As for your vehicle, just get the floor carpeted and padded and add insulation to the walls, minimum of 1". Buy Wave 8 heaters and some Federbetten from
https://www.betten-anne.de. Federbetten are German feather bed comforters - 5 minutes under one of them and you'll be warm as toast. German bedrooms are NOT heated.