I am confused about why you would limit yourself to just these two options? What is it about your trip that requires you to be "stealth" especially since you say you are going to Alaska. I would not think you would be "urban camping" a majority of your time. Personally I wouldn't torture myself if I didn't have to by living out of a truck cap for 2.5 months especially in Alaska. .
Will,
I would buy a callen camper hands down- its a steel frame and indestructible- plus it has insulation, paneling and lights standard. website is callencamper.com but you can get them on craigslist for about a grand used.
HMalice, do you remember what the height (floor to ceiling) was inside your Callen, approximately?