I know you are selling this but you may want to do a little search on Bantam TC3 trailers. I am not an expert at all, but I believe that is what you have there. Hard to find, built in late 40s and 50s I think and it may be something you want to hold onto if a sale is not really necessary at the moment. Just a heads up and I may be completely wrong on the type, bears looking into.
John