question about renting a car with carseat in NYC

Hi all,
I live in NYC and my car has "lived" in CT since 1996, when I moved (the best lookin' '95 Saturn on the road!!!). I'd like to attend a function in NJ this summer, but wouldn't consider taking public transportation with my 22 month old b/c it would involve a subway, train, and then being picked up by someone who doesn't have a carseat. Has anyone rented a car with a carseat in Manhattan? Any words of advice/caution about doing so? Thank you for your input!