I don't know about the trailer hook-up/connectors. I've added the (trailer light) capability to farm/hunting ATVs & vehicles with the 4 or 7 prong wiring kits... I would have to ask for help on the 55.2 if I decided to have a trailer light hook-up. The classic wiring harness has a lot (several, maybe 6?) of extra wiring apparatuses included. I'm not sure off-hand what the instructions said they were for.
Original wiring/lamps on my truck. My Great uncle towed his jon boat with the truck; it looked like he wired a cigarette lighter 12v outlet to connect the trailer lamps. I'm a bit young to know this practice, so maybe someone else has done this- it could be an option?
Brad
(edit - looking at those pictures reminded me: the 12v connection on the shade-tree torch welded "towing package" was functional in 2011 when I got the truck. I would have to find pictures to see where the wiring was routed. It would be easier if somebody explained how to make a trailer light hook-up.)
