The sofa will be bolted/screwed to the floor, probably 4 bolts/screws. When we had our Flexsteel sofabed removed, they took it apart before moving it out of the coach. Depending on how much room you have, you may not need to remove the chairs. Our chairs stayed in place. Here's a photo of ours prior to removal and one of the dismantled sofabed.
The smaller Flexsteel sofa on the opposite side of the coach (visible on the right in the second photo) was removed for re-upholstering. Again, 4 screws held it down, but it did not need to be dismantled to remove it from the coach; They merely tipped it up so it was vertical and manuvered it out the door.