Somehow we banged up the trailer couple so it wouldn't latch nicely.
Unfortunately, it was welded rather than bolted to the trailer tongue. So I cut it off with a cut-off wheel on my angle grinder (being careful to remove more material from the couple than the tongue).
It was rusty underneath, so i cleaned it up with a wire wheel
and painted it.
The hardest part was drilling 0.5" holes for bolts. Somehow a cheap bit from a Harbor Freight set of 30 bits worked better than a $17 bit specifically for hard steel. I think the whole HF set cost less than that one bit. I kept it pretty oily while drilling for both.
I bolted it on with grade 8 (good stuff) bolts and lock nuts.