U.S. medium- and heavy-duty truck sales reached 37,797, 27.9% above year-ago’s 32,019. Class 8 sales soared 48.4% from l3,836 to 18,950 with double-digit gains from each truck maker. Market leader Freightliner grew 39.6% in daily sales but lost two percentage points in share. International’s 99.4% sales spike gained the automaker an additional three percentage points of stake. Volvo Truck saw the greatest improvement in the group, up 71.7% on 1,943 deliveries. Sister brand Mack ...