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the prius graft is about what you want.. a gradual curve, less angle at the cab and more near the tailgate.. up to 15 degrees. From cab to tail gate may be too steep raise the rear at the tail gate a bit to lessen the angle of the slope, also slope in the sides a bit so there more horizontal in back than near the cab.. this is what is more ideal.. however even a straight slope would help, but if your going to go through the efforts.. might as well do it best you can.
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