An update on my trailer, I've been using the heck out of it and have had zero problems, until yesterday....

My fault, of course The part of the hitch that looks like a tie-rod end, well when I ordered one from the Japanese website, I mixed up the kanji for right and left, and I got one that had a left hand thread inside it I drilled it out a bit and then stuck the right hand threaded bolt I had already made into it, to keep it in place, I drilled a hole through the hole thing and put a bolt in there.
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So by weakening the structure and then putting a hold through it, well it gave up the ghost on me. Luckily, it happened just after I had dropped off 3 large cases of beer at a customer's place, so no harm done but to my ego.

I had the right part on hand, as I had ordered it as soon as I realized my error. I had everything fixed and ready to roll in under an hour

Cheers!