I went in 2008. First point as soon as you hit the Alaska Highway GET GAS!!! NEVER, I MEAN NEVER, PASS A GAS STATION without stopping and topping off !! This will make sense later! The tip about mosquito repellant is a good suggestion, but the Alaska state bird don't care about no stinkin' repellant!! Get the best anti-fog shield money can buy, it's worth every penny!! I got to the point that I didn't take of my helmet. Somewhere I have a pic of the 3 TRILLION skeeters attacking my face shield, these things are SERIOUS, like in the cartoons serious! You have been warned! I bought one of those mesh hoods, but it was never handy when we stopped. So I can't talk about it's effectiveness. I NEVER saw anyone else using one though, so I have my doubts... YMMV
Get yourself a water bottle with the little pop up nozzle like on a bicycle water bottle. The idea is you will NEED to hose off your radiator (I did) because the gunk gets in there and blocks things. So being able to pull over and kind of blast it out it helpful. You can use water from just about anywhere to rinse. When empty, that squeeze bottle rolls up to the size of a crushed soda can. Keep it where you can easily access it. I took two 10' lengths of 30amp wire (The red and black wires only) and put aligator clips on either end. I made makeshift jumber cables out of them. I didn't need them, but my dad did. They coil up fairly small. I didn't have any problems with rocks or derbris flying at me. When you see a vehicle coming from the other direction, you will naturally move away from them.
I would suggest keeping a can of Bear Repellant where you can reach it at ANY time!! I had a situation where a cager stopped in the middle of the road to take a picture of a BIG BROWN BEAR. It could have been a Grizzly, Kodiak, Brown I don't know it was freaking big! They were stopped, and I rolled up about a car length behind them. I had no idea why they were stopped. Then up out of the weeds on the other side of the road this behemoth presented itself. It proceeded to saunter across the road to our side. All the while it was VERY interested in the people taking pictures in the car. Just as he did a truck headed the other direction pulled up next to the car, blocking my escape route. This monster is less than 50 feet from me! There was no way I could turn around without getting off the road and into the weeds, which I felt would instantly cause me to tip over. I could see the cell phones flashing away. Then it happened. The bear saw me. Bright light, dressed in black riding gear from head to toe.
Just as the bear began to lumber towards us, the car pulled away. We gave the bear a wide berth, and slipped past it. IF it would have charged, there was absolutely nothing we could have done! I have NEVER felt so helpless in my life!!
TAKE YOUR TIME! There is so much to soak in and see. We tried with a tight schedule, and you miss so much! Obviously get the Milepost magazine! It has all the information about gas stations, and food, loging and such. The one thing the Milepost DOESN'T mention is that the BP station 5 miles up the road closed at noon because someone had to run an errand or, meet the cable guy. So don't get yourself into the situation where you NEED them to be open. 1 Gallon of gas will get you 40-50 miles if you are lucky! There are plenty of stretches of 60+ miles between towns. I packed one of these
http://www.campingatv.com/home/store/atv-accessories/atv-fuel-packs/2-gallon-gas-pack/ shop around you can find deals on them. I stood mine up against my top case and packed in front of it.
I don't want to sound like I am preaching, but those were my expereinces....I can't wait to go back! I'm still trying to figure out a fix for those damned skeeters!