It was back in the 1970s. It was a simple metal box--no kitchen, cabinets or anything--just the two slide out beds. It was a darker green with a white fiberglass roof. I think the brand was Otto but I haven't been able to find anything about a manufacturer with this name online. I don't have pictures...I wish I did. Does what I am describing sound familiar or did they have something super rare or possibly homemade? Thanks!