FYI Roach‘s book says this trail is 2.0 miles past the other trailhead (starts with a C) but it is actually 2.7 miles past.
I got all the way to the creek crossing 3 miles up the 4wd trail in a subaru forester but it was pretty rough. I just got new tires which give me 9.5 inch clearance and it‘s the ‘11 forester which has more torque than the previous models but even still I probably shouldn‘t have tried it. I saw a nissan xterra off road edition a mile past where I parked and surprisingly an old suburban all the way at treeline with worn out tires but he had a really bad flat. The road gets worse soon after the creek crossing. Don‘t try it in a rav4 or something like that, it doesn‘t have the clearance.