The Raptor is a very capable towing truck. With the Ecoboost, 10 speed transmission, and 4:10 gears it tows terrific. The limiting factor is the suspension. It has a GVWR of 7350 so with a vehicle weight of 5900 lbs that leaves about 1400 lbs for cab occupants, luggage, gear, and trailer tongue weight. They do have an 8500 pound towing capacity which would be tough to achieve being that you should have about 1000 pounds of tongue weight with that load.
I currently tow a 5000 pound Bigfoot trailer and it tows extremely well, I keep the tongue weight at under 600 pounds and about 500 lbs of gear, including driver and passenger.
The only issue I have and am now trying to correct is rear end squat, with that load I get about 2 inches of squat out of the back of the truck and I don't really care for the look, but don't want to do air springs at this time.