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I'm not sure you have the scales right, but, though the sport trailer will not add to your CDA, it will not help very much in reducing the drag on the rear of your SUV. The area enclosed in red is the drag area (low pressure pulling back on your SUV.) A trailor that more fully fills the profile area, and follows the taper at the rear of the profile, will much more reduce your drag. Any low pressure gap between your SUV and the trailer front would pull equally on the two, and the "suck back" on your SUV would be mostly compensared by the "suck forward" on the trailer.
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