We put in a cheap but decent 24” SuperSonic SC-2412 with built in DVD. The picture seems pretty good but it has very cheap sound. It runs on 12volts though it does come with an A/C power supply brick, which we don’t use. The mount was a Mount-It! RV TV Mount.
https://smile.amazon.com/dp/B01F2OZ0VM It seems very solid and doesn’t take up much room (depth).
But beware — on our mid-2017 25RDS the so-called centerline sticker for the mount backing was way too low, barely above the bottom edge of the backing board. I have an extra screw hole as a result.
Also the mount came with screws that are too long for the wall—a quick trip to the hardware store was necessary to keep them out of the bathroom!