Your hitch is not set up properly and you have insufficient sway control for a trailer that long. You will need to get some help from an experienced person to get the hitch correct. A properly set up TT should have no sway. After that is right you will need to invest in a good integrated WD/SC hitch like the Reese Dual Cam system or Equalizer brand. Just to start; how much tongue weight do you have? How heavy is the trailer? How did you determine which links to use? What configuration of the F-150 do you have? 3.5EB? Max Tow? Max Payload? None of the aforementioned?