Our Avenger has a back wall of the entertaiment center at the foot of the bed. The wall has a backing for mouting the TV and there is a recepticle and a coax connector on both sides of this wall. Is there an entertaiment center on the other side of the wall where you are wanting to mount the TV?
I think your assessment is correct but if you have a stud sensor you can verify your assessment --- even if the "stud" behind the wall board is aluminum, a stud sensor should detect it. I just did exactly what your talking about doing ---- my stud sensor found the aluminum stud in that position.