I basically did the same thing as northshorhenry, bought all the wiring harness's and camera from the RAM dealer, rolled it into my purchase price when i bought the truck, but roughly $200. TOTAL plug and play set up. i made a quick and dirty license plate mount to test the angle and all that before i went on a trip. was supposed to just be a test bracket, but it works fine and is still there 6 months later. this is the cheapest option out there for the RAM trucks, and its 100% factory
ps--could also drill a hole in the plastic part of the bumper left or right of the license plate and mount the camera there, slightly off center, but really clean. ive considered it, but my set up works just fine