Thanks Shawn. I posted a trip report but is still waiting for approval.
I also posted a reply in this thread a bit ago with a link to my trip report on reddit but it appears, since I used a link, that will also need to be approved.
It’s in the socalhiking section of reddit.
For anyone going, the roughest section of the road is about 1 mile after the pavement ends. I and some others parked on the side of the road and walked the 1.75 miles to the trailhead.