IMHO going after the fenders first is not the most effective course. The big dog is that trailing wake and you need a tail like the semi-trailers sport now. Next up would be minimizing the tow vehicle/trailer gap although I must say the trailer already has adequate radiussing on the leading edges so v-fronts and whatnot probably don't help much. I was thinking along the lines of shortening the hitch if that isn't too much trouble and if it doesn't result in trailer/car contact when maneuvering. Belly pans sure sound appealing but it seems the benefits are minor, especially compared to the work of fabbing them up. VGs and such- forget 'em, I think those also go in the category of either don't work at all or don't do much at all. Lastly I think you could relatively easily fab up some fender skirts from sheet aluminum or coroplast that could help that area out; I'm picturing something that looks like the fender flares on a 944 Porsche except with no wheel cutouts- fully skirted.
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