My Stehl Tow dolly I've used the hitch lock pin.
In the side of the hitch is a hole that the pin fits in.
In this picture, I took it out of the hole it belongs in and it's in the brake lockout hole.
I wouldn't backup a hill or in soft ground with a car on it. Doesn't look that strong.
You may be able to use a bolt or screwdriver, rather then the safety pin.
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