Low power effective computing?

[dbhosttexas]

I know most folks take the laptop approach, being in a van I figure multi purpose would be a better solution, here is what I am working on.

Raspberry Pi 5, yeah I am a Linux guy... running Ubuntu desktop and all the necessary apps I could want.

Van is an Econoline with the RB11 layout. What I need is some sort of wall mount for a TV that will allow me to basically side the TV over so it is easily viewed from the bed, OR slid over and pivoted so I can use the flip up table at the kitchen cabinet / passengers swivel seat as a desk...

I am looking at a Samsung 32" 4K monitor that ALLEGEDLY runs on 12v DC.

Feeding it will be the Raspberry Pi 5 / Ubuntu unit. Literally no bigger than a deck of cards. Tuner is a Hauppage Win TV USB dongle, and speaker / audio is a bluetooth Bose Jellybean looking thing a ma bob...

So the trick here like I said, and where I am looking for advice is recommendations for a good solid wall mount that will swivel AND extend so I can basically cover the entire mid / back of the van...

Am I making sense and does anyone know of anything that can work?