Earlier this year we were staying at Dutcher Creek RV in Cloverdale with plans to head to Pomo RV. Did a day trip up to Ukiah then to Medocino via a road we accidentally stumbled upon in the late '70's' when it wasn't even paved. Came back via 128. I keep a journal of all such travels for future reference. My notation was that 128 was not an RV route I would be comfortable with in our current rig. I've done 20 with a 32' Class A towing a Grand Cherokee. Wouldn't hesitate in our current 37'er.