Check out Monoprice for a different mount. They sell quality products at good prices, and have a lot of problem solving, unique items. Besides this search, try different search words.
https://www.monoprice.com/category/m...tv-wall-mounts
My last trailer didn't come with a TV. I didn't want to find the mount in the wall, and frankly didn't trust it anyway. And we didn't have more than a 24" on this (it's an older 16" in the photo. My criteria had to be some sort of quick release for the TV itself, but leave the mount up all the time, and be flexible enough to watch it from anywhere in the trailer. It clamped on to the end of the TV shelf. This was from Monoprice. It worked great, and I kept it after selling the trailer. Not saying this is your solution, just showing an example of something they sell that you won't find anywhere else.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)