At the US-Mexican border, a long-term, costly imbalance in north- and southbound tractor-trailers threatens to slow cross-border supply chains just when higher freight volumes demand faster shipping. The imbalance hits shippers hard in the spring and early summer, the peak produce shipping season from Mexico, and in recent years it has been getting worse. The imbalance in north-south freight flows and truck equipment, rather than the trade deficit between the United States and Mexico targeted by the Trump Administration, is a leading concern of shippers trying to move goods from Mexico to plants or warehouses in the United States. There just are not enough southbound trailers to match rising northbound demand for trailer space.
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