Sales of medium- and heavy-duty trucks in the United States in April fell at their fastest rate of the year, tumbling 44.5 percent from a year earlier to 17,612.
That came on top of a 13.1 percent drop in April 2008.
Through April, truck sales have dropped 37.0 percent to 70,635.
Medium- and heavy-duty truck sales have fallen every month since January 2007.
Class 4 medium-duty trucks fell the least, dropping 31.6 percent to 4,116. Class 5 trucks slid 59.6 percent to 1,806.
Class 6 trucks dropped 49.8 percent to 1,957, and Class 7 trucks fell 42.7 percent to 3,069. Sales of the largest trucks, Class 8, fell 44.4 percent to 6,664.
International's sales fell less than those of its rivals, making it the No. 1 brand for the month. International's sales slipped 31.1 percent to 4,440.
No. 2 Ford Motor Co.'s sales dropped 32.7 percent to 4,352. No. 3 Freightliner's sales slumped 49.7 percent to 3,042.
Kenworth, at No. 4, was the only other brand to sell more than 1,000 trucks. Its sales slid 47.2 percent to 1,011. No. 5 Peterbilt's sales skidded 51.8 percent to 990.