The F-Series is built rock-solid from the ground up. Its rigid frame easily handles the rough conditions of rugged job sites and continuous punishment of daily operation. The frame also is a constant width to facilitate the mounting of a wide variety of bodies. Other design enhancements include the use of high-tensile steel and closed-section cab construction to increase strength while reducing overall weight. With such a solid foundation, it's easy to see why the F-Series can be counted on for years of dependable service.