This thread was a great help for me too!
I know for the Durango, OEM tow package would have included Hitch and wiring of course, HD Radiator, 230 amp alternator, load leveling rear shocks, and full size spare tire.
I plan on installing the OEM Nivomat load leveling shocks and full size spare. I would like to add a standalone transmission cooler, OEM set up has the typical cooler lines running through the radiator. Not sure if thats included in the OEM towing package?
Anyone add a trans cooler to a NAG1 (WA580)?
I haven't got my computer reflashed yet so all I have right now are trailer running lights, no brake or turn...