Classes 4-7 U.S. retail sales rose in June to the second-highest level of the year as they cleared 20,000 units, with all segments improving over the same period last year, WardsAuto.com reported. Sales hit 20,944, the second-highest 2021 total to date. A year earlier they were 17,515. March\u2019s medium-duty sales sit at the top this year at 23,575.\nLearn more about your ad choices. Visit podcastchoices.com/adchoices