He sent me these photos of a Model T Ford and a home made Teardrop that is towed with it that was at the event. Unfortunately no information of where the owner is from or when it was actually built.
A note on the side says "This caravan was constructed using original plans in a Modern Mechanics Magazine", apparently a 1939 issue.
The outfit completed a round Australia trip in 2008 and a map is displayed showing the route taken.
Someone may know it or the owner, maybe it's a Forum member??
George