Spare tire for Alaska trip ?

We've been up 6 times and have had one flat (not a blowout). We were in Glennallen at the time and Coach Net had to contact a road service guy in Palmer who had to go to southern Anchorage to find a tire. About 220 miles just to get us the tire. Although not a Michelin, it worked fine, but the whole effort took 2 3/4 days by the time we were ready to roll again. I later checked with Coach Net and they said the road service call was about $700, not counting the $600+ I had to pay for the tire. Since then we carry an unmounted spare in the toad. Some roads in AK are notorious for flats such as the run from Chitina to McCarthy and perhaps the Dalton to Prudhoe Bay. If you're not going to go to some of the outlying areas, things will probably be fine, but....??