Welcome to Wander The West. While I'm not an Alaskan owner I am familiar with the brand. The Alaskans are still in production and framed about the same as they always have been, out of Northwest Douglas Fir and Plywood. That translates to being on the heavier side. Durable but heavier. While you'll see them on 1/2 ton trucks, a 3/4 ton truck, I think, is better suited for the job.
The question is dimensions. The older Alaskans were approximately 48" at the base so about any full size should work for that one. The critical measurement is bed sidewall height. Over the years bed dimensions change, and change between manufactures. If the camper is shorter than the sidewalls then a platform will be required to compensate for the difference. Another measurement to consider is overall truck width. The two piece telescoping construction does not lend itself well to standard swing out corner jack mounts to compensate for truck width. I don't think many Alaskans were built with bumped out construction in the rear. If you find one that is then tailgate opening width will be a consideration. Tailgate openings have gotten narrower in the newer trucks.
I know this is not your question nor do I know your location but if you're open to anything, here is a combo in the N.W.
http://eugene.craigslist.org/cto/3742326093.html It's not mine nor am I affiliated with it.
I wish you well in your search.
Your information is very helpful. Do you know of a convenient listing of cargo bed dimensions? A book is good too because the google searches are getting very obtuse with off subject advertisements.
I'm located in Seattle and appreciate links to Alaskan Campers as far away as Boise or Redding. I am thinking that I will focus on dry side of the mountains posts to avoid mold and water damage, but kick myself for passing up on an add for a '78 F250 with 48,000 miles and camper for $11,000. The rig had been garaged and was pristine.