Here is the Link on Amazon of the Curt Manufacturing harness that I used. Worked perfectly:
CURT 56584 Replacement Vehicle-Side Custom USCAR 5-Pin Trailer Wiring Harness
I also used a 5 way trailer side plug and used the Blue wire (Positive Reverse) and the White Wire (Ground) to hook to my light and then plugged in. The other 3 wires, I cut to about 4" long, taped of the flush cut and wrapped them together with electrical tape. I dropped the spare tire and it all tucked up nice and is held in place with Zip Ties. There are some detailed posts on this topic if you need more.
Here are a couple links to help search if needed for wiring and securing wires:
Installed my VLEDS LPR. This helps the backup camera immensely at night. Used the Curt wiring harnesses with the 5 pin reverse light connection and it works great. http://www.vleds.com/shop-products/lpr/lpr-reverse-72-w.html...
5thgenrams.com
Got these from tractor-supply. Fabricated mounting brackets from thin stainless steel and they are hard-wired to the trailer harness. They put out plenty of light but the beam-width is little too narrow unfortunately.
5thgenrams.com