The target angle should be maximum and final. Using 12 degrees and 63 inch bed length the trig works out to a 303 inch radius of curvature. That would be level at the cab and 12 degrees directly over the tailgate with a height drop of 6.6 inches.
If the sides curve in the same amount then 6.6 off each side would make the rear base 13.2 inches narrower than the tail of the truck.
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