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OK, I see now where this might work on account of being long enough to allow air to reattach before falling off, and, the whole "stuff the wake" principle.
Aerostealth is only going 2 feet back which leads me to think his top panel is just going to ride along under any air tumbling off the roof when sloped to 25°. That's why I suggest a 15° angle with a curve cause if nothing else it will smoothly direct air down reducing the amount of turbulence in the wake area and shortening the turbulent area in drag behind the trailer.
I really think the length variable is significant on this application.
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