I have 3 different brands of flat screens here, SANSUI, Samsung and Dynex (The first and 3rd share some remote codes not all, just enough to make my life much easier)
All 3 work well in the RV on 120 vac.. The Dynex only eats 120, forget what the Sansui eats but think it takes 120 as well.
Many brands come with a power brick and eat 12 volt
The SAMSUNG eats 14 volts (Power brick) making it a 1st class choice since 12 volt is within the range of 14-20% to 14+20%
Some posters are convinced that running their 12 volt flatscreens on 13.6 or more (Equlization charges can hit 16 volts) has damaged them.. Thus the 14 volt Samsung models would be my recommendation.. I have not hooked mine to the House power yet though, still running on shore power.
YOU will need to make sure you have the right power plug easiest way to do this is to take either the power brick or better yet both it and the TV to radio shack (Leave TV in car for now) and use their power tip selector. Handy if all TV's take the same tips.
Advantage of one brand.. Fair chance they will take same REMOTES.
Fact: I got the two "S" models at Wal*mart one was a "Black friday" special and the Samsung was a "Scratch and dent/floor model" Special.. They had lost the remote.. The first replaced an older, analog only, Samsung flat screen that basically quit on me,, When I sent it to a recycler, I kept the remote though. Dang if the new one does not use the same remote. Very handy.
The big Dynex shares a few codes with teh Sansui too, Just enough (Power and volume) to make my life easier. as my DVR's control only power and volume on the TV. (I have two networked DVR's that do magic for me, like record in the bedroom, watch in the living room, download to tablet and take anywhere)
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times