Here is my hitch detail.

I put the pin on the bike, and the Heim joint on the trailer. As I mentioned earlier, if I was doing it over again, I'd choose a heim joint with a bit more lateral motion.



The bike was all steel, mainly made from scraps I had laying around. The bulk of the rack came from some steel bookshelf? parts I had bought earlier. The trailer is aluminum, currently with wood decking. I was having a lot of problems with my aluminum welding... I need a bit more practice.