I towed a piece of equipment down the highway at 65 mph which placed 2400 lbs on my 2011 F350 receiver hitch. It towed beautifully. My brother in law lives full time in a very heavy tag trailer that he tows around to different oil well leases with his 2015 F350 SRW. My guess is that the tongue weight is about 1600 lbs....it has a 300 lb propane tank that sits right on the trailer hitch. He doesn't use his weight distribution hitch because he says it makes the truck ride rougher. A good guess as to what your tongue weight might be with the trailer loaded would be between 750 and 900 lbs. Your hitch should be rated for 900 lbs so, if you are over the manufacturer's weight rating with your trailer it would be by such a small margin that I certainly wouldn't worry about it.
