The Alcan Highway is always an adventure of sorts. I do recommend purchasing a copy of the 2013 Milepost. Available at most bookstores. Amazon.com usually has the best price of $20.00 or so. The Milepost will give you information about most current road conditions and will have ads for things like gas stations and places to stay, as well as descriptions mile by mile. Note: they talk about sponsers only, so you may find others.
The worst stretch of road is Destruction Bay, Yukon Terr. to Tok AK. You will run into frost heaves--which I call "hoop te doos". Speed needs to be kept down or you may bottom out. They are actually fun to drive once you get the hang of it. You do need to keep your attention level up though. This stretch of road is about 125 miles long and there was no gas in between locations the last couple of years. When I rode this stretch in 2010, it took alamost three hours with speeds mostly in the 30 mph range. Also pretty lonely feeling, we saw a car about every 20 minutes or so. Fill up just outside of Tok, or at Destruction Bay if you are coming from the other direction. If you are worried about fuel, add a Reda gas can to be safe.
Gravel can be found where you encounter construction zones. There will always be some construction to be found. The missing belt guard is a good item to have. Low speeds in gravel areas are also recommended. Two riders that I know of got glacial till (dust) on their brake actuators and this caused the brakes to not release completely. The :spyder2:,s thought that the brake was being ridden and caused limp modes to happen. I did not encounter that problem with either :ani29: in 2010.
The Alcan is worth the drive, the scenery is breathtaking, and it is surely an adventure. Be prepared for the worst to happen, but do not let it keep you from the ride of a lifetime. Have good (newer) tires, the bike serviced and checked over before the trip, and you should be good to go. Places to stay are quaint, but adequete for your adventure.
Most take the ferry back. You can access the ferry at Whittier, which is about 25 miles from Anchorage. That makes for an easier return trip. All that have taken the ferry have liked it a lot.
Hope you find the information helpful. Let me know if you have any other questions.