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I like the side idea pictures, that looks very close to the ideal shape. The others look to me like they would not help at all. If the sides are done to keep the flow attached than the top just needs to go from the cap on the truck to the top of the trailer. The glass part of the cap, when open looks like it is close to the right angle. I would just put a piece of colorplast from that to the top of the trailer and see how it works.
As for the pizza pans, if you do wheel skirts (covering the wheel openings) then the pizza pans will give you only a marginal benefit. They will also get in the way of checking tire pressure. So I would just do the wheel skirts. I might try some pizza pans on the front tires of the truck though as wheel skirts there are a hassle.
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