Ok, I'll take a guess ...of the ones you mentioned plus a few of the other largest Class A manufacturers not taking into consideration all the mergers through the years --and I'm assuming you're are referring to Class A RVs because if you are talking strictly about when the company was founded, you would have posted in the General RV sub-forum:
Holiday Rambler
Fleetwood
Winnebago
Monaco
Newmar
Airstream (I think they came out with their first Class A mothome sometime in the early 70s and Land Yacht Class A in the 1980s? to about 2003 or 04?)
Tiffin
Thor
It's also difficult to list without doing research as many of the old companies started out making travel trailers.
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