Yes, Alex.. Final answer.. The structural element went in the roof!
That is the correct answer RJ!
Main reason is I see deflection already (1/8") of the 46" span. Has really been bothering me. Second reason, well I do want to know how routing foam goes.
Routing is like a hot knife going through warm butter.

Man was that easy! I have several router bits to choose from, but used a 2 flute carbide straight cutter. High speed steel may be okay, don't know.. No burn what so ever, my main concern.

I did manage to get a slight bend in the aluminum angle. Using a 1 1/4" spacer (no heat mind you) I got a 1/16" bend. I can work with that!
I don't like adding heat to aluminum, or maybe aluminum doesn't like me doing it, but either being true, it just doesn't work out well for me.

Did get another area of the interior covered! Have the two little sides in the over-cab to do and the rest of the roof goes on!
Back to watching glue and paint dry..
Actually time to put serious thought to the truck and bed setup. Two main 'needs' in this. First, it has to be able to convert to a solo unit easily. Secondly, I have to have a way to sit up and pee during the night. Second one is more inportant for my wife, yet I'd like it as well if it's buggy as hell out there..
I have some thoughts, yet it's getting close to decision time.