Just a bit of history. Had a friend running a rock bucket with a pup. Pup was connected with a Pintle. No telling how many miles on it; couple hundred thousand probably. One day he comes over with the hook part and shows it to me. Right where it was forged to the mounting area...that flanged part that attaches to the truck, it had sheared right off. He was "phew" glad the state required safety chains because that thing loose, loaded or not, could have made a very bad mess.
I have seen that before and actually done in on ball bearings and their races. You can beat on steel for a long time but at some point it looses it's properties and molecularly "tears" apart. I find that tempered products are the worst. Recalling my Gantry Crane class, hooks used are required to be malleable steel, not tempered, so that they will bend, giving you a clue you have a problem, rather than snapping off when you least expect it.
Problem I see running one is the constant pounding you have to put up with as you have two oversized loops interconnected, and any horizontal or vertical movement of either end that is not in sync with the other end will bang and jerk and drive you nuts!
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