FR, Jayco, Starcraft, Thor and R-Vision are the only manufacturers that have not dropped hybrids entirely, for any period of time. at least that i can think of.
Roo, Shamrock, Jayco(including the Kiwi), Kodiak/Cub and Travel Star/Antigua, Trail Cruiser/Trail Sport hybrids have never had a time that they weren't being produced. Jayco did drop the Antigua line shortly after they shut down the Starcraft factory.
other companies that made them, did drop hybrids, such as Keystone's Zeppelin II. they just recently brought hybrids back into their product lines.