We are new to the forum, just picked up our camper yesterday, used but new to us.
I have part of an answer for you. I have no clue about where or how to mount, but I will suggest you shop for a mount at Monoprice.com. I have no affiliation with them, but have purchased all my mounts for the house from them, without issue. Supposedly it is where tv installers buy their mounts. They have all kinds of other things as well, also cheap place to get cables too!
I will watch this thread because I want to install a couple tv's in our camper as well.
Bill & Vickey