The 24SA and the new 24SS both have dinettes in those locations. Not sure if dimensionally they are compatible. I'm basing this on THORs website and the floorplans.
Originally, my wife wasn't sure if she would like the couch setup. But after using it, there are only the 2 of us, she actually liked the couch more than the dinette. It is definitely more comfortable and roomier.
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