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I saw in Hucho's book, that a Sedan had some nominal Cd number, and a SUV type vehicle had a higher Cd. But when both were paired with a trailer with a large leading front end, the SUV-Trailer had a lower combined Cd than the Sedan-Trailer. Naturally, the less of a gap that was left, the better. I'll see if I can find the graphic I am thinking about and post it for you.
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