We have a 2021 37 FLTH with a outside tv. Ours is a 50 inch flat screen. It fits, but is a tight fit. You have to tilt tv in on one side, then bring the opposite side out and move tv to the side. Then bring out tilted in side.
TV was mounted when we purchased this rig used. We use a Fire Stick with our StarLink service. It is wired to outside speakers, but TV has two zone volume control so you can either use tv speakers or RV speakers.
Mount is just one of the cheaper folding and locking ones. I think the pictures do a good job of explaining.
And here is what I don’t like. This lightweight latch holding up the door.
So far it works. I haven’t found anything different, yet.