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I think you can pretty much guess that the air coming over the top of the cab will impinge directly on the front of the trailer and then flow up and out depending on the shape of the trailer front. This is because the pressure fields around the trailer are lower than the pressure looking down into the box of the truck. This will be especially true with the solid tailgate up. It also seems to me that that is exactly what you want to happen, The only improvement would be to generate some turbulence in the flow coming off the top of the truck cap to reduce the pressure of the stream of air hitting the front of the trailer. A very smooth "laminar" flow would create the greatest pressure on the front of the trailer.
dave
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