Choosing the right size RV TV is a matter of common sense really. There’s absolutely no point buying a gigantic flat screen TV if your motorhome is tiny! Measure the inside of your RV and take into consideration the distance between the mounting point and the viewing area. The average size is around 19” screen. As for mounting options, take a look at what you’re planning to mount the TV onto and ask at your local hardware store to suggest the most secure mounting bracket that will not damage your RV.