I don't know all of them but we used Dollar last summer and signing up for Dollar Express (which takes some time so don't wait until the last minute) allowed us to go right to the garage. It was my very first time renting a car and it was just me and my two children so I was a bit apprehensive but we went out to the garage, looked at the sign board and next to our name it said see attendant. I got a little nervous but I walked to the window, gave my name and the attendant handed me a packet - pointed out the row with my class vehicle then whispered if we didn't like anything in that class we could move to the next if we wanted. We were happy with a car in our class so we loaded up, headed for the exit, gave them my license/paperwork and we were on our way in less than 5 minutes.