Most caravans will spend more time there than any other place.
I don't like doing the things that most caravaners like to do so that is a big turn off.
If your rig can handle an (often-rough) gravel road, take the Denali..but there's limited services and it's not a road to rush over.
I'll be in a 4wd truck camper that isn't overloaded so shouldn't have an issue. My plan is to average about 100 miles per day with more days allowed for stopping and taking in the sights.
If you plan on traveling at 60 mph
Then I would be wasting a trip on going to Alaska! Most days are being planned for 4 hrs / day @ 25 mph. :)