We changed ours out last summer. Sofa was a piece of cake. Take apart and out the door easy. We purchased theater seating from the manufacturer of the sofa by taking the tag and went online. We were able to get the same material as the sofa. Came in 3 pc set. Little tight getting it in but with a little padding here and there we made it. Best after market add on. We have a 2017 30x.
On my 2015 Greyhawk 31 DS, I removed the "J-Steel" jack knife sofa altogether and replace it with two IKEA POANG chairs. These chairs are lighter than the sofa was and are far more comfortable and easy to move around for comfortable TV viewing and relaxing. Check out my blog, link is below, on the mod page and see the pictures I posted. Cheers.
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MFalcon
Belleville, Ontario Canada
2015 Greyhawk 31DS
2013 Jeep Wrangler
Blue Ox Tow Package
Blog: https://mfalcontraveler.wordpress.com/