If you have a car that can be set up so you can stretch out and lie down, that is the quickest means of getting going -- it would still take 30 minutes, probably, if you need to dress and eat, etc. Use the overflow parking lot, farthest from the road, and it should be really quiet.
Nobody has ever reported the walk-in sites being full. No way it could be full in October. The hidden walk-in area is quite a ways from the trail head.
Good luck!!
