Thanks for the reply, tools and survival kit will of course be taken care of but my main worry was the car ad its less easy to find practical information.

I looked into the block heater which seems like a nice addition even though there seems to be no internal spot for it on the v8 so it'd be a pas stuck on the oil pan. They also all seem to be made for plugging into a wall outlet and I'm not sure we'll find them in hotels.

I would have loved to have a programmable remote start to run the car at set intervalls during the night but that seems to be a nightmare on BMWs so probably not happening.

I don't know if my webasto has the remote module so I'll have to check and maybe add it so I can start it early and give it time to heat the engine coolant and see if I can get it to also turn on ventilation so it slightly defrosts the car.

What do you mean by window tarp? juste a tarp put on the window? how do you hold it?

Looking and yearly weather in the region we're planning on visiting, the lowest temps seem to be around -24°C (don't know if it includes wind chill) so maybe not as bad a I thought.