2007 rockwood ultra light 2602

Our trailer is at the storage lot so I can't check for sure right now but I have had two Rockwood trailers and I believe you grab the top of the back and pull the back toward you. Once the back is down a metal frame will unfold to complete the bed. Both of mine had an air mattress hanging on the back with an electric pump to inflate and deflate the mattress this is the reason for the outlet that you see. I have not needed to use it for a couple of years that is why I'm a little unsure the exact procedure but it was never a problem to set up or undo the next morning.