Steve, Our MH is a 40ft. Thunder with the Monticello floor plan, kitchen and bedroom slide. It is a front entry (darn). Just back from the door and across from the couch is a small cabinet about 18in. wide and 28in. tall. The slide has to be out for the bed to unfold all the way. I do have to move the ottoman and lounger back towards the table. No you can't walk around the bed when it is extended, there is maybe 4-5in. We only had to remove the old couch.
Richard, the old couch came apart in 5 pieces and the new came in 4. They all fit through the front door without removing anything else. It is held down to the slide floor in the same way as the old one was(4 lag screews). There is no storage drawer under the new one. We special ordered it to get a fabric to match interior colors. The cost was about $1600. and that included installation. I had removed the old one and was able to sell it for $300.