Not a Ford but on my old Sierra 1500 I pulled a toy hauler for a while ~4500 lbs dry. The toy hauler came with an equalizer hitch and it was a piece of cake to tow had good manners. As has been said you need to learn how to adjust it right. Mind you the truck had an extra leaf that came with a leveling kit I installed too so I was slightly stiffer than stock I guess. fwiw.....
