All late 60's onward thru the mid 80's? are Land Yachts, then there are the specfic models among others;Bambi, Tradewind, Overlander, Ambassador,
Sovereign are a few of the main ones. Not all models were made all years then there were some like the Carvanner that was the same length but had an unsual interior that was only made for 3 or 4 years. If nothing else they were inconsistent
Then there were some years where the Excella trim level was available in all the lengths, and some years they were only the larger units
Aaron