On my toy hauler, there is a wire in the 7 pin connection and wiring harness on the trailer for backup lights. Mine wasn't being used, but was there going to the back of the trailer. I used my overhead loading lights in back by tapping into the switch and added a relay so that the lights come on when I put the truck in reverse. I'm probably going to add lights down low just because.
Bob and sometimes - Nina - a Staffordshire Terrier/a SPOILED pit and her kitty Spaz
2006 Dodge SLT 2500 4x4 Cummins Quad Cab w/AT and 3.73
2007 Salem Sport LE 26FBSRV (TH) w/ my Victory Motorcycle in it or a EZ GO Shuttle cart.