Freds, it's not that it would come unattached, but 3-point hitches normally have no down pressure, only power to raise, so if a trailer is hooked up and weight is added to the rear, thereby making a negative weight on the tongue and hitch, the front end of the trailer (tongue) and the 3-point hitch can suddenly jump to the maximum raised height of the 3-point hitch. It's happened several times to me, and never caused any real problem, but it could.