I've seen a lot of trucks that have the side skirts and wheel covers. It seems to be a much more common practice now than it did a couple months ago. When I went on a road trip to Memphis in October, I didn't see that many trucks with skirts and wheel covers, I think I saw 1. Going down to Biloxi, MS for New Years, we saw tons of trucks with skirts, covers, and rear pop-out things.
Some big rigs could probably benefit from using a teardrop designed trailer if they aren't carrying a large load that would require the box.
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