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I agree they work great when used correctly and wind tunnel tested and all the science and math is done and specially on air craft flying at over 100 MPH..
But like those silly wings stuck on many cars they do not work at normal legal road speeds. (Under 100 MPH)
I think I would have better luck with a wrap around air wing that pulls air into the back of the van, like those old rear window cleaners used on station wagons, they help fill the hole behind the back end.
Rich
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