Good afternoon. I was following your build and I had a question about the coupler. What size nut did you use on the inside of the tube to hold it all together? I'm guessing it uses either a 15/16" or 7/8" socket so it's probably a nut for a 5/8" bolt? I'm just trying to figure out how to build my own and options I may have for the shaft. Any recommendations on metal to use for the shaft? I'm sure I can find a machine shop to machine it for me I'm just looking for a recommendation on materials to start with. Awesome build on the hitch and the trailer.
