I remain agnostic on VGs. The 'recieved wisdom' around these parts goes like:
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Originally Posted by redpoint5
Vortex generators likely won't be much help. They improve efficiency by keeping airflow laminar (attached to the surface). If you were to place a vortex generator at the very back of a trailer for instance, it would be pointless (and actually cause more drag) because there is nothing for the air to attach to beyond the end of the square trailer.
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Other than cleaner swing doors, how would you counter that?
If this company is facing a $100,000 order, I'd make them work for it. Ask for a heat map (good locations in red, poor locations in blue)
for your specific vehicle configuration.