Tilt trailer help

[Scooter]

I'm rebuilding the tilt trailer that came with m '85 p-19 and I'm having trouble finding a replacement for the pin that stops the trailer from tilting while underway. It's about 4" long and just under 1/2" in diameter although it's far from round at this point. Any ideas what this thing is called and/or where to get a replacement? It's been surprisingly difficult to find.

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Thanks!

[SantaCruzin]

I don't know this for a fact, but it seems essentially like an extra long hitch pin for a trailer hitch. I did a quick search and it looks like you can buy 1/2" hitch pins in various lengths.

https://www.google.com/search?q=extra+long+1%2F2%22++hitch+pin&rlz=1C1VDKB_enUS997US997&ei=Y4vCZLq5B8quqtsPjvOT4Ao&ved=0ahUKEwj69oSbmK-AAxVKl2oFHY75BKwQ4dUDCBA&uact=5&oq=extra+long+1%2F2%22++hitch+pin&gs_lp=Egxnd3Mtd2l6LXNlcnAiGmV4dHJhIGxvbmcgMS8yIiAgaGl0Y2ggcGluMggQIRigARjDBDIIECEYoAEYwwQyCBAhGKABGMMEMggQIRigARjDBEijF1DpBVi8EnABeAGQAQCYAYABoAGdBaoBAzEuNbgBA8gBAPgBAcICChAAGEcY1gQYsAPCAgUQABiABMICBhAAGAcYHsICBhAAGAgYHsICCBAAGIoFGIYD4gMEGAAgQYgGAZAGAg&sclient=gws-wiz-serp

[Scooter]

Yeah, that's the closest type thing I've been able to find so far, but most are too thick and not long enough. It seriously rattles in the 1/2 hole but won't fit in the 7/16 one in my sizer. Closest is 12mm but everything else on the trailer is imperial. I suppose it could really be 15/32" but that seems unlikely.