Many TV's are already 12volt but come with a 110 cord only.
Amazon sells 12volt cords that work with these TV's.
My 16 inch is 12 volt but came with 110 cord. We have used it with a tiny 200 watt inverter. A 12 volt cord would make more sense since my RV came with 3 cigarette lighter outlets.
I used a computer display table mount attached to the corner of my booth table for mine. It goes up and down and rotates, so the TV can be aimed 360 degrees, super handy to watch it from anywhere in the forward section of the coach.
Where there is a will, there is a way.
Yeah, people laugh at my "tiny" 16 inch TV, but the color is vibrant and clear. It can be aimed at kitchen or club chairs or either side of the booth or in the middle for both booth sides to watch.
Alternatively I have a cord run from it to the stereo speakers, so if a really good movie is on, I can get great sound. Also have same cord running to the comfy chair with headset so when my friend visits and wants to watch shoot-em-up testosterone movies, I can listen to my music and he can wear TV headset. We both like this arrangement when need be.I think he likes it cause he can tune me out. :
Alternatively get a tiny power inverter to run the TV only. They are fairly cheap from $20 or so.