2013 Ford F150 3.5 V6 Ecoboost and should I tow with it??

My 2013, 3.5 EB, 3.55 axle, RWD, Supercrew 145" WB with 1607 lb. payload tows my 27.5 ft. 6740 lb. loaded, 780 lb. tongue weight, toy hauler. The 7100 lb. GVWR truck is loaded to 6920 lb., 97% of GVWR. I would not want to tow anything heavier. The engine is hardly taxed, but the rear suspension is compressed. It now has 96,000 miles on it and still runs great. I've had to replace the tires, front and rear brake pads, front brake rotors, windshield wiper switch and a turbo boost sensor. I am very pleased with it.