Accidental uncoupling - dropping a trailer -

If coupled properly it cannot unintentionally uncouple. When a trailer is high hitched then the trailer is unhitched and will fall. A trailer is high hitched when the king pin is sitting on top of the hitch jaws, between the hitch plate and the hitch jaws and not inside the hitch jaws. If coupled properly then the hitch jaws will be wrapped around the king pin. After hitching walk around behind the truck and look at the hitch and make sure the king pin is inside the jaws, real simple, that's all it takes to make sure you are hitched properly. The hitch doesn't fail, the operator fails.