Re: Reducing Tromso bed in width....
I don't think you can do this. The entire frame of the bed is metal tubing, with threaded inserts welded into the ends of the tubes to accept threaded screw-like fittings used to assemble the bed. The tube ends are rounded so as to connect fairly tightly to the tubes as the various components are tightened. Even if there was enough room at the ends of the tubes to allow them to be shortened (and I don't think there is), you'd run into an issue with being able to tighten the pieces enough to make the bed steady and sturdy.
Find out how you can get a piece of Chuck.
Just taking my inner IKEA geek out for a walk.