We have the 2009 3500RL Big Country.
On long stay we switch the chairs and the couch.
The problem is that the space from the back of the rrailer and the slides will not permit the slide to move in while the couch is in the back. There is only a few inches missing to clear with the couch at the rear.
We have been able to remove the drawer of the couch and tip the couch back to bring the slides in if we want to move the unit,
But on longer trips we move the couch over to the side.