In my travels of the roads and the internet, I've come across some odd and old campers. Some were quite an innovative concept for the era in which they were built, a few I wouldn't mind having one of myself.
The most interesting ones I've found so far are Kamp King Koaches, they had both the option of a rear Snap-N-Nap similar to the products that Amerigo produce in the same era, but also the option of a pop up roof and a roof deck, something I have yet to ever see again in Truck Campers.
There was quite alot of innovation lost when the Gas Prices soared during the OPEC embargo and later during the Carter Recession.
"All Kamp King Koaches carry a lifetime warranty in writing to the original owner" - There's something you'll never see on a Camper today!