In case you are interested:
Here is a map to the King Range BML wilderness area.
I drove the King Range area over the weekend. It was pouring rain and snow so the views were not that great, but I did check out some campsites. All are BML, pit toilet, running water, fire ring, table.
Wailaki is right along the main road so there is little privacy. No one was there on Saturday.
Tolkan is a few hundred yards off the main road and is a little more private. Wooded area, $8/per night, It was empty on Saturday.
Horse Mountain is ˝ mile off the road. It is set up as a horse campground. $5 / night It was empty on Saturday.
Honeydew Creek is a tent campsite. It is little more than a wide spot in the road. It was empty on Saturday.
Mattole is right at the mouth of the Mattole River. It’s a beach Campground, $8 / night. (We stayed there) 13 spots, 4 were used. Nice beach.
KMZ file of locations available.
Cheapest Diesel is in Willits at the Safeway. $1.99 /gal