Thanks for that picture. I am getting ready to hang a 32 inch LED (Lighter / thinner than LCD) in my 25RKS.
I hope that I can find enough substance to mount to. I am not worried so much about the size of the backer, but the lack of thickness of the backer, and weight of the tv and mounting arm and the bouncing of the weight when being towed. I if the backer was 3/4" thick. I would normally bolt all the way through the wall and sandwich another plate / backer on the opposite side of the wall and then just cover with a picture. However the other side of the wall is my shower