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At these speeds - the trailing edge will show much more significant gains. But, given the longness - I'm fairly certain flow has gone turbulent by the time you reach the end of the trailer....
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Maybe if they did a partial kammback or something... oh, and remember there's bars in the back, so no boat-tailing from the bottom. If they did the sides, there's still a visibility issue with vehicles hiding inside of the 3/4 boat-tail. So I think a Kammback would be the best bet for the rear.