U.S. retail sales for medium-duty trucks grew 28.6% in May compared with the year-ago period, according to data from Wards Intelligence. Total retail sales for Classes 4-7  trucks increased to 21,687 from 16,859. The results represent the second consecutive month showing a gain from the prior year. The only other year-over-year increase this year was in January. The only increase last year occurred in August. The latest results also were up 13.6% sequentially, with 19,098 units sold in April.

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