The above thread have a reference to a post in the old forum, where we see this picture:

Now - the regulations over here in Europe are a litle more restrictive than in USA, but to a large extent, when dealing with cars as old as Ford Model T you have some possibilities without having to come up with 100 pages of documentation

My plan is to equip my 1921 ½ton roaster pick-up with a hitch - somewhat establish 12V supply to the traiuler to make it a free coupling (allowed to haul any trailer up to the weight limit) and the prime trailer would be my Camp-let tentwagon

The pick-up: The Camp-Let: So - lets see how you have made your hitches!