I just saw my old cubby on the news tonight. It's an old vintage 1954 'don' caravan that has been fully renovated. My parents sold it a few years ago and the people that bought it fully restored it and tour with it now as a vintage caravan. It will be on show this weekend in Maroochydore.
It has been lovingly restored, complete with leadlight windows, polished timber floors, and chenille bed covers, and they tow it behind a 1961 Humber. (I found this photo of the van with it's new owners.)
I used it as my cubby house on our farm near Fernvale on the Brisbane River. Then my parents travelled with it to Western Australia and Tasmania. It was such a cute little caravan. It had double bunks and the table folded down to a double bed. Ahhhh.... Memories...