I would really recommend becoming a member of CAA or AAA and getting a 'trip tic' (not sure how it's spelled) for the voyage. It maps out your whole trip....even detours when there is road construction. They are
really worth the money and also list sight seeing things along the way and give info on each city, etc.
We used to travel quite a bit years ago so I'm an old hand at how to travel with little ones. Fourteen years ago we travelled a few thousand miles to visit my dad and my son was 3 months old and my daughter was 3...talk about a challenge!! But I was well prepared so the trip went surprisingly well. Are you travelling with skinkids too? I have lots of tips for you to keep them busy if you're in need.
It helps also to buy one of the electric coolers that plugs into the van. They are worth their weight in GOLD..lol...
Like my hubby says, when going on holiday pack your clothes in your wallet and your money in your suitcase and you'll be fine
Hope you have a great time!