We were considering doing the opposite: going from theater seating (Thomas Payne) to a 'longer' sofa. Since ours is modular - Thomas Payne Marquee Collection, we were able to remove the center console with 2 cup holders and ordered a 22" center piece, which matches exactly, even including the heat, massage & recliner. This gives us a residential-long sofa without giving up recliners, cup holders, etc. and keeping our table & chairs (also in slide area).
It is pricey - $600+/-. These pieces are very easy to install and/or change: two hooks that click in place and the screws that others have mentioned. The quality is good/not as nice as you would find for your home and it is true the screws into the floor, are quite lacking. We are full-timing and have had this unit for nearly two years and this collection has stood up well, to every day use.