We replaced the fold out sofa in the rear with a theater seat sofa. Just a hunch but I believe most furniture disassembles for shipping purposes. I was told that by a sales guy. Unless the chair has a fixed back, then the back should slide off. Only issue is the height of the arms. Since most furniture is too deep to go thru the RV door level, it needs to be turned on edge. So the distance form the floor to the top of the arm is usually the critical one for getting it in the RV.
We went with 'Best Furniture'. They seem to have a bigger selection of smaller sized recliners of which we needed for our 5er.