The system I made for watching TV in our Penguin. The stand allows the TV to swivel up and down as well as turn through 360 degrees so we can watch from anywhere in the camper, It's also adjustable for height. The voltmeter housing I made also houses a digital antenna socket and the socket on the left side of the cupboard supplies the power through a switchable cigarette lighter plug. I also added velcro on the back of the TV for the remote and a HD on which I store movies. I bought a vesa bracket from ebay for $10 and welded up a connecting bracket to attach it to the telescoping aluminium tube you see above the bench. When travelling the vesa connector I made just slips off the upper aluminium tube and that slides down inside another aluminium tube concealed under the bench top inside the cupboard. I've since added a Bluetooth transmitter which transmits the sound through the Fusion stereo.
Yes, perfectly legal!