Been living van life for about two years now and flying quads off a screen instead of goggles, so figured I'd share the stuff I wish someone had told me at the start. First big one: latency matters way more than screen size. A cheap TV with a slow processor adds enough delay to make a tiny whoop feel drunk. Get something with a proper game mode or run the feed to a monitor instead. Check the spec sheet before you buy, not after.
Second, mount your radio properly. I used to just leave it on my lap and my thumb whould drift the trim every time the van rocked. A simple holder on the desk edge fixed that overnight. Third, keep the props on the small side indoors. Even in a big van conversion you'd be surprised how fast a 2.5 inch eats a cabinet corner. I fly gentle angles inside and save the fast stuff for when I'm parked somewhere with actual room. Last thing, power. Everything runs off my leisure battery through an inverter and I learned the hard way to check my draw before adding a second screen. Add up what each device pulls first, then size the battery around it, not the other way round.