U.S. retail sales in December of Classes 4-7 commercial vehicles reached the second-highest volume for 2021 despite declines across the board. Sales in the month fell 8.9% compared with a year earlier, WardsAuto.com reported. Sales were 22,326 compared with 24,507 a year earlier. December\u2019s total trailed only March\u2019s 23,575. Full-year sales increased 10.1% to 239,703 compared with 217,753 in the 2020 period, according to Wards.\nLearn more about your ad choices. Visit podcastchoices.com/adchoices