How long are you gone for. Chicks move eggs around in the incubator fairly often so if its not too long it should be fine. I had one chick hatch that was a bulldozer who I had to take out early as they knocked around all the eggs. He was insane. Hatch turned out fine, but I only let him do...
It won't like you when it dies in the car. Don't go on the trip. Or leave it to hatch on its own and leave food and water in the incubator for it and hope for the best.