Thanks for all the responses. I'm not sure where my friends are at the moment, but I have posted a link for them so they can see people's comments.
Their truck is an international specification Ford Ranger (2.5 turbo diesel, no DEF). Their camper is an S Karosser:
S Karosser (Sweden)I know people in northern Russia leave vehicles running 24x7!
He did say that -35C would be the absolute lowest, so not all the time. Here is what he writes:
I have just landed a job working in Abisko National Park in Sweden from mid November to April and we will be living in the camper for the duration. This is about 150 miles north of the Arctic Circle. Obviously having a Skarosser is going to add a few insulation points to our cause but what do I need to do to ensure a toasty winter?
Temperatures can get down to -35º but this will only be for a couple of weeks at most, generally it will be -10/20. We will be demounted and on a permanent electric hook-up. We will have access to internal facilities but the toilet and water tanks will need to be used at certain times.
My concerns are waste water - should I leave open all the time?
Legs (jacks) - are they up to surviving a full Arctic winter, can the extreme temperature do damage?
Windows/skylights should I invest in extra insulation and if so are there any pre-made to fit demountable window measurements?
Base - should I give an extra coat of weather seal - if so what do people use?
Cheers and all advice welcome especially anything I've missed :)
Steve.
