here is the camera mounted on my tailgate. I'd have preferred the handle mounted one...but I couldn't argue with the price
99-07 trucks have a 6 pin mirror harness. 08+ trucks already have a 16 pin harness.
I had to custom build a 16 pin harness for the mirror connector. You can order the factory harness for $50, or build one like I did for $15.
Wiring wise, it was very easy to run 2 wires from the tailgate to the cab. I used stereo RCA cables. Had a 10ft section that I split and joined end-to-end.