trailer couplers

jaws said

If it took that much for you and your son to pull the tongue down, that was your issue. Should have dropped the deck and put the tractor on the trailer farther. The wedge inside the cup is to hold the ball with weight on it. Needs 250# min. on the tongue.

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thought we'd be ok for the low speeds and short distance we were going. That deck is a pain to R and R. We made it back to my son's house just fine when we were done /on main roads too /with same truck trailer hitch and load.we weren't fishtailing at all either at those low speeds.
That coupler still should not have come off the ball. Both are 2". Now if I had a 1-7/8 ball on a 2" coupler or some such mismatch I could easily understand what happened.
Yeah I know that couplers are all over the place, but I was hoping to find just the compatible guts to avoid having to grind off the welds holding the current coupler body to the rest of the tongue.