The overriding question is what are the lowest temperatures you're likely to encounter during the season you're there. Standard 50/50 antifreeze mix is good down to -30°C. The engine oil might be better down a notch on viscosity, but depends on what you use now. The brake fluid (DOT4) should be OK as they sell it in Alaska. But more pragmatically, any travel agent for caravanning holidays in the Arctic should be able to advise you. From my brief experience of arctic Finland, things aren't that different really.
Be sure to fit an in-line thermostat!
TC
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