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Hard edges are very tricky because your cap would have to be very well designed to prevent vortex formation. The 12° slope is NOT what you want, it is too steep. Go with 7-
8° and you'll get more storage space, way better lift coefficient (Your truck will fell more planted and stable, and still get 90% of the optimal aerodynamic benefit. Plus it will be way more forgiving of any design errors.
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