I used a Samsung T22C350ND in my 2006 PW Lexor TD
it replaced an older 17 or so inch
I fabbed a little bracket to mount it on the swinging door
it is DC native, so low(er) energy use
has a media player and usb so I can play 200 movies from a thumbdrive, rather than boxes of dvds
I also have a similar samsung in our guest room a 32", also native DC ( look for the models which use a transformer)
they both came from costco, $130 and $160
the 32" wouldn;t easily fit in the van the way we use it.
I have seen large monitirs in vans though
Mike