Does your traverse have the roof mounting for luggage? I wonder if you could come up with a deflector to keep air from slamming the front/top of the trailer?
I would look at closing in the wheels, skirts on the trailer, and smooth bottom on the trailer.
The traverse is fairly aero and that trailer is not. The front of the trailer is significantly larger than the rear of the traverse.
Can you snap a few pics of it hitched?
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