Dog car sickness. Road trip?

My dog usually vomits in the car or drools a lot within 10 minutes of being in the car. In the summer, my family and I might take him on a 8-10 hour road trip with occasional stops. He is a Brittany Spaniel (medium sized dog) and will be around 9 months old when we go. If we take our dog, what will be comfortable for him to ride in? A crate will take up too much space in the car.ThanksWe DO NOT plan on leaving our dog in the car.He is micro chipped.