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It seems that a major redesign is required to significantly reduce cross-wind tipping, but any change in shape is going to adversely affect the cargo-carrying capacity or overall dimensions. I would suggest that the top two feet of the trailer be retractable vertically via pnuematics in the supports. The skin would have to overlap some to provide a seal at full height and to allow movement vertically. The supports would have to be slightly bulkier, but the cylinder could be small and protected by the support itself. I imagine the back door would need to be the two feet shorter with a vertical flap for full height access. Thus when the full height isn't needed, the trailer could be shortened at the push of the button, and the wake and side loading in crosswind could be reduced almost 15%. The trailer would only need to be at full height when it is loaded to the top, so that should help with tipping. I can't imagine it not saving fuel when in the lowered position, and it may be enough to offset the added expense. It would be interesting to see what your flow simulation would predict for drag reduction.
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