If you value your time, I strongly suggest you do not use Dollar car rental, at least in San Diego.  When we showed up, they were serving people who had been waiting in line for 2 hours.  Everyone already had a reservation, and was just trying to pick up a car.  It took us 1 ½ hours to get to the counter.  When we returned our car, we talked to people in the line, and they had been waiting over an hour.  You can walk to other car rental places, and their wait time was about 10 minutes.  The others were out of cars.  Part of the delay is that people kept coming back because the trouble...