Sorry, I don't recall which one, but one of the 4-Wheel magazines I take had a write-up on installing a rear camera on a JK a few issues back. Had to be in Jp, 4-Wheel & Off-Road, or Four Wheeler. You might be able to find it on line. Anyway, they went to a motorhome/travel trailer dealer and used the same systems they use for a back-up camera. You might check it out.
I wish someone would come up with a good one like the one in my F-150. The camera image is in the rear-view mirror. I can't see out back because of my tire carrier.