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Air flows from the back of the truck through the gap between profile and rear and joins the flow from the sides as it reaches the end of the side panel.
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Why? What impels the air to flow outward through the gap?
I presume the profile is similar to the 'wake boards' in that illustration (I don't stand behind any of that. I'd like to see 'passive porosity' explained for instance). The wake boards appear to be the start of a boxed cavity. They could be angled or inset [citation needed].