avis does the same thing: they ask you if you want the ez pass to be activated and if you say yes, they put abbreviations in the fine print that indicate you agreed to their ridiculously priced "unlimited tolls" package, even though there are other cheaper ez pass related services, and because you sign the rental agreement in order to get the keys, you don't have a leg to stand on if you dispute it later. because the charge is abbreviated, it took 20 minutes between the invoice and their website to even decipher what the charges were for. if hertz and enterprise are doing it, must be an industry-wide scam.
I went to the US last year on business, and rented a car out of the airport.
Not only they could not tell me in advance how much it was going to cost, but also everything in the final invoice was abbreviated and laid out in a nonsensical way. I tried summing the values in every possible way, and it never got to the total they charged.
I'd be absolutely pissed if it was my money.
Funnily enough, rented from the same company in Germany, and the experience was completely different. Clear value, fees, easy to understand invoice.