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I think it would be VERY difficult to mass produce a truck or trailer who's additional cost due to engineering offset fuel cost by enough to make people's heads turn. The construction of a brick-like trailer is just so simple compared to something more aero. That simplicity likely also makes it less weight and more durable/repairable. Every time I'm in dad's shop there is a trailer there with a bent bumper or scrapes down the sides, or a gash in the roof. If it was made of some wavey-shaped fiberglass it would be more expensive to repair.
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