I saw something like that in the latest GoodSam magazine. I think it was an Outback. Seems like it was more like a sunroom that popped up out of the top in the back with a stairway inside. I believe it was a toyhauler, too.
I saw that in trailerlife magazine, I believe it was the March 2008 issue. It looked pretty cool, I believe it was a keystone toyhauler. I'll double check tonight, the magazine is in my "reading room".
Don't know if that is what they are talking about. At Harrisburg PA a few years ago I saw trailers with decks on the roof. I mean sink, grill, chairs, umbrella etc. I mean the works, but I can't remember who made them. They had stairs from the living ares up that would rival what is in your house.