Still the first rating you probably hit with a Heavy Payload F150 is the hitch rating. My neighbors 2014 Heavy Payload hitch of 1140 if I remember right. Maybe someone would post a picture of the sticker on the hitch of Heavy Payload. When I towed TTS I liked my tongue weight at or over 13% so that will keep the TT less than 9000 pounds(9000 X 13% = 1170). Ford got the 11,000 plus rating using 10% tongue which I wouldn’t want tow with that low percentage. That rating is before you hook up the W/D. My 2015 Ford 1 ton had a 1250 pound hitch rating my 2016 GMC had 3 inch receiver rated like 1800 pounds.