Have you been there before? I think you'll love that trip. For your return trip, consider taking the Cassiar Highway, which is a western alternative to the Alcan. The Cassiar is *much* more scenic, not that it will matter since it will be dark most of the time you're up there.
How long are you going to be up there?
I travelled to AK from Minneapolis on my motorcycle a year and a half ago. Alaska is an amazing place and I think about it every day. I want to move there. Of course, I was there in July and August, so I don't have the complete picture... Anchorage actually has more mild winters than Minneapolis, though it is considerably darker. I'm looking for work up there.
Have fun, bring recovery equipment, be safe!
Jim