First get the mechanical problems out of the way.
Then get a piece of plywood, and stretch it from the top of the cab to the end of the tailgate, with the tailgate down. You may have to screw two pieces of plywood together to get it long enough. You will probably have to make a frame underneath the plywood. Arch the plywood up in the middle just a little bit to make a nice aerodynamic curve. Fill in the sides with plywood or foam or whatever you have.
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