Which one of his movies did Arnold Schwarzenegger name his campaign bus after when running for governor?

Which one of his movies did Arnold Schwarzenegger name his campaign bus after when running for governor?
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When my parents first told me that Ronald Reagan had been an actor back in the day, I didn’t believe them. When Sonny Bono became a congressman, it might have been even more surprising. But I’m not sure there’s ever been a more surprising famous-person-turned politician than when Arnold Schwarzenegger ran for and won the governorship of California.

For one thing, he’s from Austria. Foreign-born governors, as you might imagine, are pretty rare. In fact, Arnold was the first one in California since Irishman John G. Downey in 1862. But I think Schwarzenegger probably had a bit more star power than Downey, or pretty much almost anyone else who’s ever run for office of any kind ever.

And he put that star power to good use, even naming his campaign bus after one of his films. Which movie was it?

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