I have traveled to Alaska on 3 occasions. Your first question is what typical vehicle goes to Alaska. Well, I have found it to be all over the map, but mostly large motorhomes and big 5th wheels.. If you see a class C, it more than likely will be a rental with either a British or a German family aboard. Bring a towed!
As to damage, I personally have received more damage in the lower 48 than on the 2200-mile trip to Alaska. Windshield breakage rates among the highest damage receive. I found that trailers break axles due to excess speeds. Many areas of the road are under construction and when the sign says 25 km, it means 25 km. When we went on an organized tour, our wagon master told us everything we need to know about how to prevent damage. They, also, know what is the best speeds to travel.
As I said, I have been to Alaska 3 times by road. The last two times was by organized RV group. I promise you I had the most fun here. Traveling with a group gives you safety, you have friends to share the grandeur and beauty of the tour with in the evening and you don't need to worry about getting those hard to get tickets for excursions. In addition, the leaders on these tours are familiar with little known and out of the way places. They are keyed into the weather, road conditions and forest fire alerts. So, they have alternatives in their hip pocket if a road closure happens. By all means investigate the RV caravan option.