As handye9 said, there are so many different setups that there is no standard. Just do what works. Our old trailer had a folding shelf for the TV so it could not be permanently mounted. I used a removable monitor arm from Monoprice.com and just took it all down when traveling. In our X20E I found the arm still works great, but now I can just leave it clamped in place and remove the TV when traveling. There is a mount or arm available for every conceivable application.
![](http://coldwater.smugmug.com/Hidden-Galleries/Camper/i-pdzVXqR/0/M/IMG_2553-M.jpg)
![](http://coldwater.smugmug.com/Hidden-Galleries/Camper/i-kb6sxTX/0/M/IMG_2554-M.jpg)