This trailer still exists. We had a bell trailer for my daughter at one point. Before that I built a big wooden trailer that my oldest son rode in. I'd have to scan that one in from our album. A very old picture. Frighten contraption. Built it with a handsaw and a second hand drill my father-in-law gave me. I'll try to post it at some point.
First serious ride of the hack bike paired with a new £40.00 ebay trailer. Loaded with at least 60kg of manure it handled quite well but i think i need to add a prop stand. Next for the big weekly shop (after i've hosed it down!)