Yes! I am teh winrar! Tremble before my mad google skillz!
Here's my clue:
I saw this movie when I was a kid, when it hit theaters in 1979 (I'm old!). I was seven and it was my second favorite movie after Star Wars.
I know a lot of movies came out in the late 70s, and a lot of them were road trip movies like this one, so this is a really hard one. But don't give up! I'll go ahead and give everyone a clue so this thread doesn't grind to a halt.Google Clue: They're in a 1951 Studebaker.
There. That should be enough to get you guys started. Good luck, everyone!