Home/American Shipper/ATA: Truck tonnage inched up in March American Shipper ATA: Truck tonnage inched up in March FreightWaves Staff · Wednesday, April 23, 2014 Facebook Twitter Pinterest LinkedIn Domestic truck tonnage inched up 0.6 percent in March after rising by 1.9 percent in February, according to the American Trucking Association’s For-Hire Truck Tonnage Index.