YC 1 wrote:

Take Highway 20 West out of Williams. 37.1 miles.

Watch for Highway 53 as you drop down a hill after a fairly long climb. Easy climb and multiple lanes.
Turn South onto 53. You will go about 8 miles. Look for the sign to Highway 29 which leads to Kelseyville. This is a nice road and will become freeway in a few miles. Eventually you are back to two lane for a short distance and will come to a stop sign. You are back to Highway 20 again. This leg is about 30 miles. Turn left and enjoy the beautiful drive right to 101

This route will bypass the two lane twisting and winding on the North side of Clear lake. If you want a good view of the lake go ahead and stay on 20 all the way to 101 instead of the bypass described above.

And I am indeed someone that took a 30 footer with a Toad up route 1. It is a scenic route with some tight turns but I use turnouts when possible. The Willits road from 101 to Ft Bragg is very twisty but in excellent condition with plenty of turn outs. Use low gears and take your time. It will take you most of an hour to traverse the 33 miles.