We had tried video in the car for our teens, but found that audio books worked a lot better - shared experience, nobody has a bad angle/line of sight, can still see the scenery and engage in the travel, less looking down prompting motion sickness, etc.
Though now that everybody has a device, we have to intentionally opt for a shared experience, rather than 1:1 devices.
and audiobooks with really good narrators? the miles will melt away.
(I like Wil Wheaton)
(don't know about lotr oudiobooks)
(currently part way through we are legion read by ray porter)