Hi @sebastienbuick the other National Lampoon's "Vacation" movies are European Vacation, Christmas Vacation, and Vegas Vacation. None of those are really car/travel heavy, with exception to European Vacation where they trek across Europe. They are all very funny though, if you enjoyed the humor of the other two you've watched.
Canonball Run is another fun movie. Grand Theft Auto is another one with Ron Howard. The Outsiders was adapted from a book but features the fifties culture, but not too much on the cars, but it might strike your fancy.