Hotshoe 36, I really like your set-up--I see that the way you work that truck makes the extra strength is very important for you. We used racks for the rare times we needed to haul a cow or two--so getting them on & off easily was more critical for us-I was only 9 or so but could do it by myself.I don't know if the hinges were fairly standard or something my Dad "invented". He made several things so that I could do work alone--
Thanks for the tip about the EDIT feature but I cannot find it-- these old eyes aren't as sharp as they used to be!

Glenn