Using the OEM camera if fine if you have a relatively short camper or unless they left a lot of extra wire stuffed in the tail gate. I want to be able to use my tailgate occasionally so I opted for a separate camera/harness. Routing the wire so that it was supported but admittedly not taking the most direct route I needed a ten foot harness. Bigimac indicated that he wanted to go above his door so he will need an even longer harness. Bigimac, I noticed in your signature that you have upsized your tires one size to LT275's. Any clearance issues? I have the same truck and am planning to upsize tires soon to the LT275's also to add a little more weight carrying capacity.