My sister was heading home with her trailer and went over a bump in the street. She was going slowly as she knew the bump was there. The trailer popped off the ball! The safety chains were hooked. Tongue fell and skidded on the pavement, broke the jack, trailer swiveled sideways and the receiver poked a hole in the trailer aluminum. The gas station guy who came to help said her ball was worn out. It's the original on her 2002 pickup. Just thought I'd pass on that head's up in case anyone is using an older ball.