a variable color fiber - optic lighting system for pickup trucks that utilizes an optionally changeable in color light source , disposed within the confines a pickup truck &# 39 ; s tailgate , whose light is directed to a series of fiber - optic cables which , at one end are aligned adjacent the light source , and set out in a configuration corresponding to the trademark of the truck &# 39 ; s vendor at their second end on the exterior of the rear side of the tailgate .