I removed the sleeper sofa from my Jayco right after I bought it. I don't remember exactly how I did it, other than unscrewing the frame supports from the floor. I may have disassembled it before tossing it out the TT door.
Your furnace might be hidden under the sofa. If so, you'll have an ugly plywood box in plain sight. I built a finished plywood box, withe a register for airflow, over the existing box. There was a half-wall behind the sofa, which I also removed. The trim on the half-wall edge fit was reused on the edge of the remaining wall.
It's nice having the extra space, since I didn't need the sofa.
2011 Dodge Ram 1500 HEMI Quad Cab
2011 Jay Flight 26BH