The last 4 round trips we have made to Alaska have been in a truck camper. We don't tend to stay many nights in one place so don't really need a tow. If we are staying a week in Fairbanks, Valdez or other urban areas, we have at times rented a car. Most of our trips have been in a mid sized Class C without a toad. Only remember pulling a toad on one trip. Nice to have while there, but a pain to get it there. When RVs get over the 30 ft. range, toads seem to be more useful to have with you. Most full timers pull a toad everywhere they go, so a trip to Alaska is no different.
We now camp in a 31 ft Class A and pull a Jeep Wrangler on most trips here in the lower 48 May try to work in another trip to the north country next summer, but not sure if the Jeep will get to go or not. Sold our truck camper and 5th wheel so no longer have the option of taking one of those. I tend to tell folks, just take what you own and are comfortable driving.