Eric -
The thread you are referencing discussed the weight ratings of the four stabilizer jacks, not the tongue jack.
As far as your tongue jack is concerned, it is apparent that someone either tried to move the trailer while the jack was still on the ground, or retracted the jack a little bit, moved the TM, and the jack caught the ground while the trailer was moving.
I would have the jack replaced. The problem as I see it is that once the metal is deformed, the jack could suddenly fold up and collapse at some time in the future. You don't want the 500+ pound tongue weight to fall on your foot (or worse).
Bill
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