Sure hope you get some feedback, I've got the same questions.
Tried to Google search some pricing on RV's today but couldn't find a web site or a dealer that listed their weekly rates, or any rate, for that matter. A rental RV will be my Alaskan transportation/lodging solution.
I've driven my own rig, with my fifth wheel trailer up there from Utah. Will never do that again, simply a poor economic decision on my part. 7,500 miles at $5.50 a gallon, (more now.) plus RV parking/travel costs up and back. Can't justify it, if seeing Alaska is the objective.
If you want to see the Alaskan highway, though Canada, that might be a different story.
DC