K.B.
I have 4 kids still at home. My 17 year old is self-sufficient, but my 8 year old triplets need help. We've always had them grab an old backpack and put in their Leapfrog computers (learning), 3 books, 1 coloring book and snack bag with 10 crayons, and 10 small non-noisy toys (Hot Wheels, Pet Shop, etc). We have a specific number of items so every time it's time to pack up we'll know if something is missing. It sounds like you've got a good start. You're not going to come up with a perfect situation so you can only do the best you can and hope the restlessness is to a minimum. I do try to have conversations with the kids, point out things on the road as we're going, the kids play I Spy and other road games that you could probably Google, and take the stops you need. I always force everyone to sit on the toilet even when they say they don't have to go, limit drinking and have plenty of snacks. Shade guards on the windows help, sunglasses, earbuds for games or music. Force the kids to run and run when you make a stop!
K. B
mom to 5 including triplets