A box blade on back does help you... it provides a stall point where it maxes out in height, and then is rigid, where the wheels will have to break traction.. ( or theBB or 3rd link has to fold.. etc.. )
Thast's why it's mandatory to use a drawbar lock, sway bars, and stays, if you run a ball on a 3pt drawbar.. keeps it from rotating, keeps it centered and not swinging, and keeps it down in case the nose of the tractor comes up.. or the front of the trailer goes gown.
most people ignore the stays and therin lies the problem..
soundguy