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I think you've got the right idea. If you shoot for around 10 degrees and miss +or-, you're still looking at a huge improvement in fuel economy. I think you've got the right idea on the sides too. If what you're getting at is to first mark the profile for slope on the top and sides, and then go from that intersection down to the side of the bed for a transition, then that should work really well. It sounds to me like you've got blueprints in your head for how you're going to build it. You should be able to get the shape right, or at least close enough to get the benefit. The next question is, what are you going to use to build it? I'd suggest using some sort of transparent material at least for the vertical piece on the back to allow for some rear view.
Please keep us updated on your progress.
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