That figure shows the safety changes improperly hooked to the vehicle. The hook should come up through the vehicle's eye instead of being hooked over from the outside of the eye. I know because I did the same thing last fall and the chains came off when the hitch came off the ball. Luckily, all that happened was that the trailer hit the back of the car and dented the lift gate.
I have since switched to using quick links in place of the safety hooks because they cannot be put on incorrectly.
Brian
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