We usually go to Kernville from the Central Coast via 58 to Commanche to 178. After nearly 10 years of going that way if you look far enough ahead to know who's coming down the canyon it gets to be not so bad. First time it was a bit concerning.
It was several months ago but we came over Walker Pass with our 38' 5th wheel. Much less streeful as the road is wide and turns are well marked and your view of upcoming curves is generally good. As was mentioned before the downgrade side is long but no issue if you have engine braking.
