[maple_leaf_eh]

If it is what I think it is, then you have the linkage between an MLVW CP and a conventional section of modular. The one I'm familiar with is square on the top side where it laces onto the box, and is held up and out from the door with special universal jointed arch. Then, there is a set of complicated skirts that attach around under the tailgate and the stairs. The bottom end laces onto the modular tent as per normal.

I'll run that NSN to see if it matches the one I've just described.