In the highly competitive truck market facing tough economic conditions, the 2008 Ford F-Series F-250 / F-350 Super Duty Truck is off to a good start. Especially the high-end, most capable models that some dealers say are "flying" off their lots. The strong launch has boosted F-Series to a 25,000-truck lead over the Chevrolet Silverado as Ford trucks build on an unprecedented winning streak of 30 straight years as America's favorite pickups. While the F-150 is the sales leader in the lineup, the Super Duty more than holds its own.