Here’s my advice. Everyone does their normal routine except you keep the kids up an hour later than normal. You pack the vehicle during this time. At 1 am you wake everyone up and load them into the vehicle. At 9 when everyone starts waking up, you are over halfway there. You stop for brunch and a clothes change, pop in a longer movie after 15 minutes of driving and now you are close to 11 hours in. Basically down hill slide from there. Done this many times, but I can function on 3-4 hours sleep. That is a key. (Plus driving with everyone sleeping and no music on.