The quality of medium-duty trucks has improved considerably during the past five years, but overall customer satisfaction has declined during the same period, according to the J.D. Power and Associates 2011 U.S. Medium-Duty Truck Customer Satisfaction StudySM. With a score of 807, Hino ranks highest in customer satisfaction within the conventional truck segment for a second consecutive year. Freightliner (762) and Ford (757) follow in the product index rankings.