I agree with the Bull part , I picked up Rosie at 8 weeks old from my breeder and that one way was a 6 plus hr drive as you can see she did fine slept most of the way.
We took a lot of fresh water and bowl , her food , toys and treats . We stopped at lest once a hour for P and Poop play breaks , due to play at stops she slept , she was in her kennel app 1/2 the trip and half on My lap or beside me on seat . We have people here on the site drive across there countries with there dogs and ask for the same advice all the time , if it is cold out turn the heat on if it is warm out turn on the A/C just like you would need . Think the key to our trips is a lot of stops and make the time to do those stops , it is just like having a child in the vehicle right .