If you haven't already, check out this site: http://www.farmcollector.com/equipment/vintage-wagon-manufacturers.aspx#axzz32qLf9OeL
They have a 4-5 page article that may help identify. They may also have a forum where you could post pics or ask for help. Good luck with your search
I was there when it happened. Epic times. Awesome memories. Here is my piece I picked up myself. 4 inches thick or so. Hope to pass it down to my heirs and have it last forever.
You are a fortunate young man. There is nothing like old things handed down through the generations. Enjoy the memories and make some of your own to pass along. I love my old stuff.