I've read all the info on the site about wiring harnesses etc. I have found a steal on a new 04 SE Crew Cab, the only thing is no hitch. It has everything else I want on it. What I need to know is if I buy a Nissan OEM hitch will I have to buy anything else to get the hitch wired for trailer lights. Does it come with everything and where does it plug up etc. I need all the details I can get. Thanks in advance.