One of the first mods I did. I mounted some rectangle white bright fog lamps and ran a wire from the plug terminal and a battery hot to a DPDT switch mounted near the rear of the trailer. Switch one direction, the lights illuminate off the reverse position. Switch the other direction, and they're manual "on" for whenever I want light back there without the truck. Very handy, although I very seldom use the manual setting. Extremely bright, white light. Never fails to get the attention of whoever is back there.