I am going to mount 3 tvs to my 345bhts. One in the front bedroom, one in the bunkhouse and one in the outside kitchen. My question is how thick is the wood behind the walls and how long of a screw can I use without going through the wall and damaging anything? Also does anyone know of any good mounts for the Tv. I would like 2 swivel mounts and one standard mounts. The swivels need to lock in place. My dealer has a pretty nice swivel mounts but he wants $150 a piece for them and he is a jerk and I would like give my money to someone else.