You don't need 4WD on that road, just drive slowly. Lots of regular sedans do it. The danger is running over a sharp rock (they aren't large), that might cut your sidewall. But most people and cars make it in and out just fine. Make sure you have a working spare tire.
The hike up and back or the ride up and back is not a walk in the park, since you start at 12k and go up to 14k. You should get as close as you can before starting the ride/hike -- at least this first time!
