We just bought a 24" Insignia TV (Best Buy house brand). Like LeonW, we have a Jensen radio with DVD player, so the convenience of a Jensen TV was tempting, but it cost nearly 3x as much!
We chose ours in stores by checking the back for the DC voltage, Insignia was the only one, vs LG (17 or 18 V) and Samsung (14 V), that used 12 V. We had to separately buy the power cable with 'cigarette lighter' to 'universal' connectors.
We bought the 25" extension Master Mounts 404L (made by McNaughton, but at a higher priced if bought under that name). It locks in place, so we had initially intended to leave it mounted. But in light of Donna's comment that a trailer is undergoing a constant earthquake while underway, we decided to follow LeonW's lead and put the TV on the floor of the closet for traveling.
The 25" extension of the cantilever is barely enough to get the TV free of the cabinets for viewing from the passenger side dinette seats. It also centers the TV above the night stand, barely back from flush with the cabinet front and not quite touching the wall. For watching from bed, the 25" extension allows the TV to be closer to the bed, enhancing the 'big screen' effect.
The mount also can be tilted vertically, by two screws with large, convenient, plastic knobs to hold the adjustment.
To make removing the TV easier, we bought an Ergotron quick release mount that goes between the MasterMounts and the TV. Disconnect cables, push a lever, and lift the TV out. The lever looks like nylon plastic, tough but will probably break eventually; however, this shouldn't matter as long as we always remove the TV before traveling. While stationary, gravity will reliably hold the TV in place [at least every time I've checked, gravity has been dependable.
Except for the TV, everything here is available from Amazon, among other places.
It was nice to get this all mounted and connected, and learn that our Jack antenna works well, as many others have said.
Now to see whether we will actually use all this stuff when camping.