Wow! Wow! Wow! This trip is insane. I love it. Already enjoying following along and it hasnt even started. Cant wait for the post where you underestimated the cold and failed to pack anything to stay warm. Visions (disturbing visions) of the two of you cuddled up together on the side of the road waiting for help come to mind.
But seriously... its been mentioned to have tools, fuel, and emergency towing, but... its freezing up there. Make sure you can stay warm enough for working on the car, waiting for help or even just being stuck in traffic that isnt going anywhere due to wintery road conditions.