If the leading edges (sides & top) are radiused, then proceed directly to the tapering addition at the rear of the trailer.
I'd make the rear extension as long as possible. The smaller the cross-sectional area where you truncate (assuming you retain attached flow), the better your results.
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Then I think, "why bother?" I should just drive 5mph slower and avoid all that work. 
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Or do both, and double your savings.
