We also have a Designer 5er, a 2004 29RLTS, with the two recliners in the back next to the large window. Decided that we only needed one, and took the other one out the door and into the house. Took two people to do it, holding the chair sideways and guiding it around and through the door opening. Snug fit, but we did it with no problem. Also, to keep the bottom metal pedestal from shifting during this process, I put a bolt through a convenient hole in the lower framework that sticks out and prevents pedestal movement.
As for the couch, I have no experience on this one, but I think it is possible to take some of them apart - you just have to inspect them closely underneath before you buy.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.