Nissan makes 7 pin trailer plug kits for the Pathfinder OEM plug and play, relay will also be needed. I have a 2008 and just installed the kit. far better than the aftermarket kits . I also purchased a Reese brake controller with the Nissan harness, also plug and play ( plug located under knee panel below steering column .
The newer Pathfinders have for ratings of 5000 lbs properly equipped, so don't listen to the salesman.
The older ones like my 08 V8 has 7000 lb tow capacity and 700 lb Tongue weight. The Older V6 models had 6000 lb and 600 lb tongue weight capacity. I also installed a set of air lift air bags and would suggest the same