A Toyota subsidiary will shut down its largest auto parts plant in the U.S. over concerns about a difficult path to “sustainable profitability.”

Hino Motors Manufacturing U.S.A. opened the facility in Marion, Arkansas, in 2006, making truck frames and axles for Hino commercial vehicles as well as for its Toyota parent. It is by far the U.S. division’s largest operation, accounting for about 70% of its workforce in the country.

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