Some of that info, like the unpaved road and needing extra tires may be outdated. They have completely paved the entire Alcan at this point. They do go thru yearly road repair after winter and you will run into that on the way. That's why I suggested asking in the Alaska/Canada forum since those people have up to date info and not: "I drove the Alcan 10 years ago..." info.
There are also a lot of travel diaries/blogs available. Search Google for "Alcan travel diary" and you'll find a lot of them. Some are useful others not.
There are two books that almost everyone recommends:
Mile Post 2014And this one:
Alaska Campgrounds