Did my "rent an RV" trip to AK back in 2002. Awesome scenery. Eventually, you will just stop taking pictures because around every bend is another beautiful view (plus back then digital cameras were in their early stages and the memory cards--remember those?--filled up quickly.)
If you find yourself going down the Kenai Penninsula toward Homer, Russian River Campground was very pretty and quiet. Also in Homer, you can actually camp on the beach (I don't recall what kind of hookups they had there, though.) If heading up toward Fairbanks and Denali--they have (had) some odd rules at Denali...they don't let you drive out the park road, unless you're camping at Teklanika CG (30 miles into the park,) but you have to stay there for 3 nights and you can't leave...so we didn't do that.
Also, Exit Glacier was awesome--you could walk up to it and pick up pieces of glacial ice that had fallen off (which was also great for pouring Kentucky bourbon over later.)
As I did not drive up there but flew and rented, I can't help you with any AlCan or TOW recommendations. Oh, but don't drive up the Dalton highway. It sounds like a good idea until about 3 miles in when every dish in your cupboards is broken...
Have a great trip!
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