Here's the finished installation, and it is quite strong:
Mounting of the TV bracket to the wall is now on 1/2" plywood.
Travel / Storage position:
Extended and pointed down so it's viewable by both the lower bunk and the upper bunk:
And a the top view:
The stain I used wasn't as "red" as I would have liked it to be, but it isn't a bad match. I could always put a veneer or a wall paper if it bothers me, but so far it doesn't.
The mount is quite solid, but I am putting a removable bracket on the TV so it will be taken down during travel. The other option is to mount a strap to the wall to secure it against the wall and install the stand to support it during travel. Either way I am happy with the results.