Mine had the twin set up in it when I got it and I like the twins better than a double but the walls are too concealed with the twins to suit me. Concealed walls are where all the nasty happens in an Airstream it seems. Concealed leak damage, dirt, bugs, and "rodent" evidence. I cleaned out a terrible mess when I removed the builtins and stationary ductwork.
My re-do will feature a cleanable laminate floor covering from wall to wall except in the center bath and the kitchen area. I removed all the builtins in the living area as well and I intend to use a movable sofa and a recliner for seating space. All movable and cleanable.