Look about 7 post down......
http://www.advrider.com/forums/showthread.php?t=398040
google " mini truck slid in camper " for images of dozens and dozens of ideas
One of those flat fiberglass tonneau covers with a canvas type expansion
section on short 3' - 4' walls would work well. Someone on here just finished a real nice trailer using a truck topper as the roof section on fixed walls. It's all possible......
I like the way this guy thinks.....
http://cheaprvliving.com/BuildYourOwnCamper.html
One thought, since the rig is removable why worry about the taller profile as it will only be a small penalty when it's mounted for camping. Anything moving up and down is an invite to water intrusion. This guys answer was a simple attempt to streamline his with an air deflector.