Travels With Charley by John Steinbeck
It's a well written and entertaining book, even if it's not mostly true. I'm pretty sure Steinbeck made most of it up, probably while the camper was parked at a luxury hotel where he was writing from a couch with a whiskey nearby. That said, he did nail a few things right on, particularly the homogenization of America, and the lack of respect for the environment. I'm not sure it quite deserves the lavish praise it gets though. Good book, but probably not a classic IMO.