last time I did it that way, about 5 yrs ago, I drove down to the end of Filmore St., and there was a little house (trailer house maybe). Anyhow the people there seemed poor but friendly. I offered them $5 to watch my car, they would not take it, but they let me park off the road, and in their front yard. when I returned the next afternoon, I left a six pack of soda on their porch. They lived right where the road ends, on the left side, where the road ends and the citrus grove begins... again, it was 5 years ago. I started in the afternoon and packed up to the "bench" at about 3,200'. If you are real observant, you can find a trail at the toe of the ridge starting at about 1000-1100 ft, it goes up the ridge and it will be fairly easy to follow up to about the 3000' level, and then it becomes harder to find after that. hope that helps, it is in my opinion, the classic route on Rabbit.
edit: to add a little more, I've done Rabbit at least 5 times from the end of Fillmore. I used to drive through the lemon groves out to the edge of the desert, where the groves end, but it does not gain much ground, and I always wondered if my car would be there when I got back. I've done it as a dayhike twice from Filmore St., and backpack 3 times, and I prefer the backpack. The bench at 3200' is a great place to camp, it's the halfway point. Above that it's steep and unrelenting. The route above the bench used to be ducked somewhat. The only times the navigating got tricky was when the ridge flattens out near BM 6623, you have to be careful not to descend the wrong way on the return. I did not have a gps, so I had to be alert. Also, when you are exiting the bench back down to the ridge at around 2800' on the return, be careful there so you can go back down the trail. Also, the three mile approach across the desert to the toe of the east ridge, if you do it right, there used to be a well-ducked route across the desert, done with "white" rocks so you can see them better in the twilight. Always go WITH the grain of the mountain on Rabbit, if you keep cutting across the washes it will tire you out fast. The very first time I attempted Rabbit was from the east, using John Robinson's book. I did NOT find the trail between the 1000 and 3000 foot level, I kept cutting washes, I got a late 8 AM start, and I paid for it. Also, I underestimated the peak and ran out of water at 6000 ft. I was young and strong though and got out just fine, but it gave me a lot of respect for that mountain. I personally think Rabbit from filmore St is one of the best classic hikes, at least for mortals like myself. Perhaps today it would only take half a day for some, LOL
Pardon my spelling and grammar, I never learned to type.