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1/2 inch Tow Hitch Hammer Lock Safety Chain Connector Link Hammerlock Coupling Link Grade 80.
Instead of the pins provided, i use grade 8 bolts with lock nut to facilitate easier initial setup. None of my trailer hooks fit the Ford hitch very well, so I had to do something.
The issue with connecting the trailer chains was limited to the 2.5" receiver hitch as I recall. The 3" receiver isn't a problem. Hammer Locks are one solution. Supposedly, there are other chain hooks that will fit better.