TracRac 42000-03 G2 Overhead Racks for Ford Super Duty/Dodge Ram Rack structures combine with TracRac 21000 series base rail to complete the TracRac G2 sliding rack system for pickup trucks Rack upright/crossbar supports slide in separate tracks within the base rails (sold separately) to any spot above the pickup bed Elliptical-shaped crossbars and air foil "trip strip" minimize wind resistance and noise Internal web structure in crossbar and Wide rack foot construction increases rack strength Heavy-duty load stops tie-downs on crossbars, and aluminum ARC side cleats provide tie-down spots for load securing