i am thinking of putting a piece of wood in the middle of the span that is about 1" taller so it bows the upper board up and gives the cap a rounded shape to it.
also should i make the top piece of plywood on the cap extend past the tailgate off the back a bit? i am thinking about extending the plywood as far back as the rear bumper off the back of the truck (about 5") and then on the sides at the back making little pieces that return to the tailgate. making kind of a little kamm spoiler
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