I have never seen one......but you can call and check before going
Yes they do
You have to request before hand
As the 2 others have said before, when you are making your rental car arrangements request a child seat at that time. Of you are making your reservation online and are not able to request the car seat, just call them and they will make certain that you have one for you when you pick-up the rental car.
City locations will not have them, but most airports will.
Thanks! Your answer is awaiting moderation.