You definitely need a strong mounting position for the bracket. Also, you will want to install a strap to hold the TV on the mount, keep it from bouncing around and potentially coming off the bracket while traveling; the vibration can cause the mount attachment to fail if it is stressed by the movement of the TV. I mounted a DVD player under the TV using a small shelf I purchased on Amazon.
Have you thought about how you are going to get a TV signal?. There are multiple types of antenna's available so do a good job researching the pros and cons of each; these can range from small over the air (OTA) antenna's to something like the Winegard 360+ that rely on local broadcast signals and of course there is always satellite. Dish has the best plan right now; you can start/stop it as needed. I have been told by several RV dealers DirectTV is making some changes to their mobile satellite service and equipment so now may not be the best time to consider DirectTV.
Good luck in mounting the TV and enjoy the comfort of home it can provide.
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2020 Kodiak Ulta Lite 201QB
2018 Ford F150 Twin Turbo V6
Logging the miles in the USA. Adventure awaits around every corner.