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With the trailer mentioned above, the ' hump' doesn't add that much frontal area because the trailer has so much length.
With a car or SUV or whatever, the length is very short and the hump would add a larger percentage to the frontal area versus the length to work right.
That's my speculation .
It would be super easy to test. Just place a large sheet of thin plywood on the roof of the vehicle and test it at different profile heights. ( strapped down of course - DUH)
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