Would they sleep in the car if you left at bedtime?

We are making a 4 hour drive to visit family this weekend. Right now I'm thinking of leaving Friday night, doing our usual bedtime routine only putting her into the car seat instead of the RnP, so leaving around 8:30 and driving straight through. I'm even considering doing the end of her feeding in the car and just plopping right into the seat. But she doesn't love the car and usually doesn't fall asleep. Do you think bedtime will be better? We could also leave sat morning after she wakes up and eats but then it's just nap time and I am afraid she wouldn't sleep since it will be light out.

Any experience? I get so jealous when I hear people say how their babies just go right to sleep in the car

Good thing she's cute.