An amber warning and work-light package on a Chevrolet Silverado 5500 HD crew cab carrying a Knapheide KUV enclosed service body, built for Sacks & Sons of Zieglerville. A medium-duty chassis with a body already on it is a different job than a patrol car: the lighting has to clear the compartment doors, the rack uprights and the body seams, and every run has to cross from the chassis harness into the body without fighting the body builder's own wiring.
Amber surface-mounts sit low on the cab sides ahead of the rear wheels, with amber at the upper rear corners of the body and across the back so the truck is seen from behind when it's stopped in a lane or a driveway. The body's own marker, stop and tail lighting was wired in alongside it, with a green indicator on the body side, and everything was loomed and sealed at the crossovers so the harness holds up to a work-truck life. Company lettering and DOT numbering finish it off.