i was towing a full sized ford van
behind a mid sized moving van once
the expansion crack bumps every 30' feet
on a grade set up a vibration pattern
that loosed the ball hitch and began filing off the threads
one by one until there were only JUST two left
the NUT was already long gone....
so , i won't feel comfortable unless the ball hitch
is drilled through below the nut and cotter pinned
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