I'm not confused at all, I have already stated the biggest problem with most wings are they are too far away from the trailer to be effective.
Another situation with a wing is very few are set to the right angle, causing a futile fit. May be just may be RZv'ers with wings should also incorporate a faring on each side of the truck to push the wind a way from the sides of the trailer!.
Again a little pen and paper will help you work out the ideal angle and hight and width required. If done right there will not be a bug line !!! But all this is getting away from the original question.