If it makes you slightly less nervous... we have a "no electronics in a moving car" rule (aka no games on the phone, movies, etc.)... and I've driven all over the country with my son. We talk, listen to music, listen to audible books, stare out the window and use imaginations.
We DO stop a bunch for runaround time, and when he was little we'd leave point A at noon (just after lunch... playing in the hotel room/pool/breakfast/ etc. then get in the car and have lunch in the car), he'd sleep, we'd stop when he woke up, play/eat, drive, stop to play eat, he'd sleep, then we'd play/eat/pjs, and he'd sleep till the hotel (around midnight) be a little goofy for half an hour or hour, and sleep till morning.
Now that he's older (9) he rarely sleeps in the car for more than an hour nap maybe once a day. But we have GREAT conversations.
There's very few things I won't do with my son JUST because I didn't when I was a kid... but movies & videogames in the car is one of them (which may be kind of ironic, because we have a LOT more screentime than most people at home). There's so much to SEE out those windows!!! (Planes are boring...and you can't pull over a jet for an hour on a playground for the cost of 99 cent fries... so we do movies and laptops on planes... but the car is pure freedom).