The spring loaded hitch weighing device sold by a top accessory Co that looks like a sawn off pogo stick. (or is that a sawn off shot gun?)
Dam near took my head off last year when it slipped out from under the hitch and hit me in the face. I had a 90Kg upper cut. Now I have no feeling in my lower lip, and several smashed teeth.
I threw it in the skip and bought a tiny one which locks both in the cup of the caravan hitch and the tow ball on the car, much better.
Still could of been worse. Had it of hit a child at that force they would not be here!!