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Similiar thing happened to me. Except mine was 100lbs and I hadn't tied it down for months, it wasn't moving after all. I used 1/2 osb and covered it with FRP fiberglass reinfoced paneling(bathroom section home depot). Didn't realize how heavy it was until I put it all together. I was doing 60mph with a 20mph crosswind, flew 20ft in the air..luckily no one was near me. It was to heavy anyway for the occasional removal. I was going for waterproof too.
Is 12.5 the optimum angle? Would a soft top design work or is there to much loading? Is there significant efficiency if you boat tail the shell as compared to going from top of B pillar to tail light?
I can weld, so I would build a B pillar frame, and bed rail frame and stretch some material over it.
I do a significant amount of long trips with my F-250 and would love to bump up the mileage.
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