We travel for holidays and other times throughout the year. We have a 5 year old van. It has a DVD player.
We have some DVDs but not a ton, most media is digital. The van has no way to hook it up.
Here is what I do and this is a pretty good tip if you can do it.
Find a Redbox in the city you are in – Walgreens usually has one. Rent a few DVDs for one night, maybe 5 bucks.
Then at your destination – drop them off. Works every time!