The checkout process for Hertz is extremely slimy. While, I was filling out the form, the checkbox with a childseat didn't mention any kind of fee, so I assumed it was free. At the end of the form (which takes about 20m to fill out), it says "some fee may apply". When I got to the rental agency, it turns out that "some fee may apply" was 100$!! I threatended them with a big 1 star review on yelp, and they lowered it to a more reasonable 16$. needless to say, i will never risk using hertz again. they've shown, they can't be trusted.