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Interesting pressure zones between truck & 5th, not sure if this is 2D effect or real...
The "big truck rule" (as per KENWORTH) is that gaps between tractor and trailer of over 30" overcome aero aids such as spoilers. A closed gap -- preferably no more than 24" -- is where this "crosswind" begins to abate (and why I have a problem with the idea that a pickup pulling a conventional trailer is helped by a spoiler when the gap is generally four feet or more).
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