All the car rental companies have shuttle buses that pick up customers from all the terminals at LAX - there are signs indicating where to head from the baggage claim area - there are also signs along the street outside the baggage claims telling you where to stand to wait for your car rental shuttle, they are indicated in purple - the buses comes around quite frequently - we book with Budget and have never had to wait more than 10 minutes tops for a bus. It is a good idea if you've not been to LAX before to use google maps and street view if need be to plan your trip from the rental company into the DLR area. It's not a difficult drive but it's certainly helps to be prepared.