TV mount on pivot wall

TV=television

We recently purchased a new trailer that has a pivoting TV wall in between the master and the living space.

Layout

The back of this wall area is 1/8" ply. There is a solid piece of something running vertically at the mid-point that is about 4" wide and not much thicker than the ply backer. The whole inside is covered in a felt cloth making it difficult to see what the center support is.

I'm trying to figure out:

1) What is this solid material in the center? Metal, wood, plastic?
2) Is the plan to anchor only to the solid material in the center?
3) Should I be anchoring a piece of 1/2" ply to the center bracket, and then mount the TV?
4) If I just mount to the center bracket, would I then expect to have exposed bolts and nuts on the opposite side of the wall, or is there a trick to avoid that?

I am handy and willing to go to town on this thing if necessary, but would much rather cheat here. None of this is addressed in the manual, so I'm hoping one of you might have a similar setup.

Thanks for any advice.