Originally Posted by kittlecat
I agree with Slp2go. If you remove the cushions that would support your back if you are sitting on the sofa as a regular sofa (there should be velcro holding the back cushions in place), you can then lay flat the black foam behind the back cushions and slide it towards the rest of the sofa sleeper. I have the exact sofa sleep in my Rockwood Ultra-Lite TT except it is fabric.
I went round and round with the RV dealer about my sofa sleeper after I had purchased the TT new in March 2016. It was manufacture defective when I purchased it and would not stay in the upright, locked position no matter what I did. It took some cutting and re-welding but my RV tech at the dealer was finally able to fix that problem after re-working the sofa frame. I was also never shown how to properly use the sofa sleeper when I bought the TT (open or close it). My tech, again, came to the rescue and showed me how to use the sofa as a sleeper. My sister sleeps on my sofa sleeper when she camps with me and she does use a 1.5" mattress topper. She has actually said the sofa sleeper is rather comfortable now that we know how to use it correctly.
THANK YOU Kittlecat & Slp2go! When folded out into a bed I did discover a black part that lays flat towards the top of the mattress that is attached to Velcro and wondered if maybe it was supposed to come apart and slide that piece forward, but I didn't want to ruin anything trying to do that. Now I know it's ok to do that! I'll give it a try on our next camping trip which starts tomorrow.
As far as locking the sofa in place, ours is pretty good, but not perfect. It will come unlatched if someone sits slouched on the couch. Probably wouldn't hurt to have them check it when we take it in for several other defects that need addressed this winter while we're not using it.
Thank you everyone for your replies. A great group of people here!