For sound bar, I do not recall, it was just one that I had laying around the house not being used that was given to me as a gift.
For the bracket, I bought these from Amazon:
https://smile.amazon.com/gp/product/B01GUIEFJC/
As for keeping the TV out, on my coach, on the TV swing arm, there is a knob on the top by the wall, you tighten this down to prevent it from swinging.
The Dash DVD player is a joke, because you can not use it while the coach is in motion, so it is useless as far as I am concerned. If I am not in motion, I will use one of the other TV's.
Hope that helps.
Thor Forums
