Same thing happened at the Kurnell ramp 3 weeks back. It is a shallow and long ramp. At the end, is a drop off, and the car driver, dropped off.
Some gooses around. I was waiting to retrieve my boat a few weeks back and after the 5th go at backing down the ramp, the driver just kept going and the trailer went off the side of the ramp and sideways across the boulders. The dope dragged it back up and told me to retrieve my boat, so he could see where he was going wrong. JG would have done his block, but I was just taking it all in and wondering at the stupidity of some of the human race.