I relocated my flip down couch to the rear of the trailer. I could get one bracket to line up with a wall stud but not the other. So, I bought a 1x6 from HomeDepot. Sanded and Routered the edges then painted it an off white to match the walls. Used a stud finder and drilled pilot holes in the wood at every stud (Three total). Then I attached the couch brackets to the wood(counter sunk the bolts to the back of the wood) and then the wood to the walls. Attached couch to fold down bracket. Problem solved.
I did the same process to hang a 30" TV bracket on the inside of the trailer.