The F-250 is a heavy duty truck with a 3/4 ton capacity as opposed to the 1/2 ton of the F-150. The Super Duty line was redesigned for 2005 with new exterior and revised engines. The ride is stiff and bouncy, especially compared to the F-150. Ford's 6.0-liter turbodiesel packs some real punch and is fairly quiet and free of vibration. Stepping into the cabin is more difficult because of the high floor.