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Yes! # 2 is more what I was thinking.
I would take the top part all the way to the trailer box (it will reduce the slope and hep keep air attached). For the sides, a gap is not as big of a deal.
Idea 1 is ok, but the slope needs to match the angle of the roof of the trailer to the top of the truck cap. You also do not need the bottom half of the budge, so I would got with your second picture.
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