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Your numbers look good, however the underside "suface" is the worst and therefore would represent an even larger portion of the drag. The sides are smooth and flat with few large changes in cross section. The top side of the average pickup also dispreportional with respect to the % affect on the total drag of the air passing over it. The underside will also be affected by "ground affect" in what manner I don't know? When I look at the under side of my Aerostar van I see the worst aerodynamic surface emaginable, with big things sticking out all over the place. The underside of pickup trucks is the same. So even if only 10% of the air goes under the truck it still may represent a disproportional affect on total drag... thus being a better place to look for gains? and has the added advantage of being unseen...having no affect on apearance of the truck.
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