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Seems like those humpback semi trailers to me, which I think to be gimmicks.
But I suppose if you have a flow detachment issue just aft of the top of the windshield and you can correct it with a SMALL ENOUGH hump such that loads of frontal area aren't being added, it's possible it could help. Still, if the flow on the stock roof reattaches well enough towards the rear (no racks and stuff up there) maybe the whole exercise is moot.
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