A quick attempt at Googling failed to turn a picture of the Hertz rental car, but I found an interesting article.
http://www.scca-milwaukee.org/Newsletter/PDF/july04.pdf
ME, MOTORCARS & THE PEOPLE WHO DROVE THEM
Part 4
By Bob Birmingham, 2003
[...]
While relaxing around the pool of the Mark Thomas Hotel in Monterey, he told Hansgen, Penske, Heuer and others how he had floated a Volkswagen in Oconomowoc Lake. One thing led to another and before long bets were made that Augie couldn’t float his Hertz Rent–A–Car. [...]