i didnt even realize what a good option it was at the time when i orderd, but i didnt get the lights installed
I ended up buying the the plasmaglow led lights off amazon
placed them under bed rails
ran the wiring through the cab vents ( easy ) and up into the third brake light i tapped into the left and right wires of the white bulbs and spliced the ground together and tapped into the ground wire of the third brake light.
now when i press the button for the cargo light on the dash the lights come on!
Before all this I asked my dealer to, and they said "well its still a new truck we really dont know yet ......"
so it only took me like an hour and it was alot cheaper
pic below
OH!! and as for the wiring already being there for the lights ... did not see a single thing : (
unless its somewhere inside the truck behind the back panels