Our original plan was to hike out to Little Jackass Creek, camp there and head out to Usal the next day. Unfortunately my knee had been in pain since our hike up Chemise Mountain (probably from the steep descent from King Peak with a full pack).
Our guide book described the next couple days hike as having an elevation gain and loss equivalent to hiking to the bottom of the Grand Canyon and back up. With my knee as it was we decided to hike out by way of the considerably less severe Old Wheeler Road. One of these days we intent to go back and finish.
The old Wheeler Road is an old dirt road that climbs easily but steadily for the first few miles. You can't drive on it, but I believe that bicycles are allowed. After climbing for a few miles it descends at a very gentle grade pretty much all the way to the campground at Usal. Much of the ascent is in shade while most of the descent is going to be sunny. This is a fairly long hike so we left at the crack of dawn but arrived at our car at Usal by around 11:00 am. We went pretty fast, despite my knee, because it was such an easy hike.
Old Wheeler road is nowhere near as scenic as the proper trail is supposed to be, and there are no ocean views, but it's nice to know that there is an easier alternative should you be unable to continue along the trail.