Very nice series of images, Øivind. It must be a great experience to be there.
Photographing dog sled race is very fun. Last year, I saw the start of the Femundløpet race in Røros, Norway with very nice winter conditions and cold, nice weather. My biggest memory cards was quickly filled up :-) Indeed lots of things and action to capture. For me, it was also a conflict between recording video and capture images, as some of the action and the overwhelming noise is fun to have on video :-)