We did a long road trip with Jaxon and he was pretty good (ended up being almost 10 hours on the way, and 13 hours on the way back). I had a flossie for him to chew on and that kept him busy for awhile. He slept a lot too and we just made stops along the way so he could get out.
For dog friendly accommodations, check out:
www.dogfriendly.com
You can search by state and hopefully find places.