They are all brass 3/32" sq tube, 3/16x3/32" rec tube and flat brass bar for the gooseneck. The pintle hitch trailers are 3/32" sq tube. I use a finish nail for the hitchs. Joined together with silver solder. The single combine trailers have wheels bought from Moore's farm toys. The double combine trailers have DCP semi wheels. The trailers pictured do not have DOT tape on them but when finished they will.

I have a guy that will powder coat them for me. At least he will practice on one and see if it will work. Concerned their will be too much heat and melt my solder. Hope not, they would sweet with baked on paint.

Here a few pics of them going together.

Eric