It seems there have been quite a few failures. We need to remember one thing. When the pin is pulled, and the swing tongue moved around (or not moved, for that matter), the hitch cannot take any weight. In other words, you can't pull the pin, open the tongue, swing it, and then crank the jack down onto (for example) a block, or the jack wheel. With only half of the swing tongue engaged, I think it is obvious that this will encourage a failure.
We first talked about this in Post#5 of this thread - but it was way back in Feb 2006, and things get forgotten ...
Bill
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