Thanks, I changed "ball" to hitch" in my post above, since that covers any hitch failure. I had a near failure similar to yours. My son forgot to add the pin to the coupler after hooking everything up. He nervously asked me to pull over a few minutes after we pulled out, still maneuvering city streets. He hopped out, found the coupler open and just resting on the ball, and the pin still sitting on the bumper. Thank God we had good tongue weight and that my son did the right thing and asked me to stop. I think he was 16 at the time. I can guarantee he will not mess up again when connection trailers. He had connected trailers many dozens of times before that day, and many dozens since. His safety check routine after that day makes me proud.