Driving to Alaska
I did the trip in '97. I left Portland, OR in the beginning of May and then got back to Colorado around the end of June. It was an amazing trip. I had some food, one spare tire (and needed it, your right two would be best), and picked up one spare gas can. I needed the gas only when I chose to get of the AlCan highway and take the Cassiar Highway (580 mile long dirt road, with one expensive gas station/diner in the middle of it). The Cassiar was amazing, only truckers out there doing 50-60 mph on a bad dirt raod. By the time it joins back up with the AlCan you're up in the Yukon. Probably wouldn't need an extra gas can though as long as you fill up before you hit the road in a diesel. Taking the Cassiar saves you about 500 miles on the AlCan.
By the time I hit the AlCan again, I had a busted shock - just hanging there underneath my truck. Saw two bear on the road and one Moose. Saw a lot more the whole time though. The time I needed the spare tire was on the way back from Manly Hot Springs, a tiny little town off the road to Prudhoe Bay - about 80 miles south of the arctic circle. On the way back I blew a tire, had a spare, and then got an extra when I got back to Fairbanks.
It was an amazing trip!!! I would also highly recomend the Homer Spit on the Kenai Peninsula.
Also, by the end of that same summer I had driven all the way down to Key West (southern most point) and had come from Homer (the western most point you can drive to in our hemisphere), and 80 miles south of the Arctic circle. A LOT of miles that summer.
I plan to go up there again, but fuel IS expensive.