Sterling Truck Corp. announced on January 14 that it has received the highest overall ranking for conventional medium-duty trucks in the 2003 J.D. Power and Associates Medium-Duty Truck Customer Satisfaction Study. The Medium-Duty Truck Customer Satisfaction Study is based on interviews with more than 1,400 principal maintainers of two-year-old medium-duty trucks (Classes 5, 6 and 7). The study analyzes customer satisfaction in three main areas: product, service, and parts; and covers criteria including vehicle performance, product quality, interior and exterior design, dealer service, and parts availability.