Hey, did you try that "White Rocks" trail w/the locker? (it's not on the trail map, but I think you take Fremontia grade to get to it; the beginning of the trail is full of large quartz ("white") rocks)
I followed this subaru-rubicon thing a bit; it's a bit confusing, but it looks like they did a fairly small part of it, then had to leave because they ran out of spare parts or something.
Here's a couple Pirate 4x4 threads:
Thread 1 Thread 2