We had a conversion van when I was a kid and from our perspective having the TV and VCR in the car was the best feature for long road trips (I think for my parents the comfortable seats with built-in massage function was the best feature). I feel like the conversion van started disappearing about the time that LCD screens and DVD players became a common option in minivans. Out of curiosity I looked a few years ago to see if the company that outfitted our van still existed, and they did but now appear to mostly be upfitting pickup trucks.