Millions of Americans will be hitting the road this summer for vacation. But that doesn’t necessarily mean rental car companies will be pulling in big profits. As a matter of fact, Hertz Global Holdings - best known for its rental car brands Hertz, Thrifty and Dollar - saw profits drop almost one hundred and seventy percent last year. Company revenues ticked up slightly, landing Hertz at number three hundred thirty one on the Fortune 500. But it continues to lose money, and market share.