I moved the TV from the back wall to the front of our rig and added a sound bar.
First removed the upper cabinet door and build a support (fore ground) and cover (back ground) for the mount.
Screwed the support to the cabinet frame and the wall behind it and screwed the cover to the support structure.
Fabricated an aluminum bracket to mount the sound bar to the TV mount. The wireless sub sets on the floor under the dash.
All done!