We do 6-8 hr drives regularly with my 2 year old. My recommendations include special snacks or treats, a magna doodle, favorite books, electronic toys like vtech “laptops” or see & says, and other toys that are lap friendly. I also try to time the trip around his nap so he’ll be awake for a few hours, then nap, then be awake for the last bit. Breaking it up like that helps him handle the trip better.
A box with holes for the kids to travel in and plugs for the holes if they get roudy!