I've use a pintle receiver hitch, turned upside down so it wouldn't stress the gate while under load. Also for lighter loads I've used a heavy shackle to the safety chain for a trailer connection point on the truck.
I have used a large Porty on a pintle and tow hooks with a 5/8's" pear link. I like the Porty to be able rotate more than attaching to the pintle without a link allows it.
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Are you guys putting aluminum porties on steel pintles? Not good to mix aluminum and steel.
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The two do react and corrode. I was concerned about that with aluminum biners and steel rings. I don't think it's much of a worry having short contact like while working. I would avoid storing the two metals together especially if it's a moist enviroment.