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there are people that have optimised truck and trailer rigs, on this site, try different search phrases, if i find them ill post it for you, as i recall they worked to enclose, as best you can the gap between rig and trailer, and also i know even smallish kammback,s on the rear of the camper might help, ,,,alot if the rear of the rig is rounded, air breaks of cleaner from a sharp line than a rounded edge. there is also some info up at the top of this forum in the "sticky" .
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