I'm posting this at the request of Hurricane and for any other interested viewers. This was the procedure for the trailer hitch.
I would have prefered to use aluminum, but I couldn't find the size I needed or the ability to make sharp bends, so I went with copper. For the first section of the hitch I used a part from an old child trailer hitch, but I'm sure with some flat stock and light steel tubing, one could weld one up easily enough. This mounts to the rear axle. (see hitch photo 1)
Next I took a 3 inch piece of 3/4 copper and drilled a vertical hole in the end leaving enough for about 1/4 inch overhang on the inside of the hitch. A slit could be cut in the top and bottom of the tube instead to allow for up and down changes in the road, but I just made the hole a bit bigger. I may cut a slit later. A quick release pin connects the two. (photo hitch 2).
After that I soldered a 45 deg. angle so that the tongue is pulled away from the frame some to allow for better turning. I capped the hitch end for strength and flattened the tongue end. On the tongue end I drilled a hole, and the same on the long part of the tongue connecting the trailer with the hitch. I added a bushing, a couple washers, bolt and lock nut to complete the hitch section. (photo hitch 3) And for those critics out there, yes I know,,, I didn't get the hole centered.. So What!
To finalize the whole tongue section I measured out from the hub to the end of the back tire and cut my tongue tube. This gave me enough of an angle to make sharp turns without rubbing the tire. The rest of the tongue sections and bends are obvious per the photos.
