I made the trip to Alaska with my Interstate in 2014. Road conditions were generally OK in July. Still some construction delays put no big problems. If you go up there too early, like in first part of May, you will run into worst road conditions. Buy the end of August most road construction is finished.
My view is people who broke an axle drove too fast for conditions and didn't heed the pot hole/road hazard markers.
If you are even thinking about driving to Alaska get a copy of Milepost. It is a must have to guide you along the ALCAN Highway.
http://www.themilepost.com/
Have fun and plan on getting stone chips in your windshield. I got two on our trip. One repaired in Anchorage and one in Fairbank. Did not get stone chips while on the ALCAN Highway. Got them on paved roads near Anchorage and Fairbanks from gravel trucks. One going in my direction and another going in the opposite direction.
Got my third set of stone chips while in Colorado last year. One of these days I will likely have to replace my windshield. I think I'll do that after I make my next trip to Alaska.