X5 to the arctic circle

[scourtaud23]

Hi to all,

I'm looking for input from people that drive or have driven around the arctic circle in the winter as my family is planning a roadtrip from geneva, switzerland to finland, sweden, norway (the route is not completely defined) but the goal is the arctic circle.

As of now we're going with 2 classic range rovers LWB, maybe a 322 Range rover and my x5 4.6is. (no diesels, all V8s)

What should I add to the car (beyond supplies)? I have the OEM webasto heater fitted (nice surprise when I bought it) but I'm wondering about a second battery (optima maybe), oil heater pads, ...

What would you recommend?

Thanks for the help