Schmitty, it's not really that simple. Yes, your Pathfinder should have no problem pulling a trailer weighing 2000-2200 lb. If you are just speaking of dirt bikes, your average of less than 300 lb. per bike is realistic. If it includes one or more street bikes, maybe not.
The big problem regardless, will not be pulling, but stopping. If the trailer does not have brakes, it will extend your stopping distance noticeably when loaded. Some states advise brakes on trailers carrying over 1500 pounds. At moderate speeds on dry roads you should be OK, but it is a consideration.
One critical factor for stability is to have a hitch weight at least 10 % of the total weight. Too much weight in the rear makes a trailer very squirrely.