I drove it last week with the truck and camper in signature. There are hard switchbacks beyond Jenner climbing to the top of the bluffs. A couple wide turnouts before Timber Cove including a couple 300 degree turns (it seems).
We stayed at ocean Cove campground and I know some of the motorhomes, toy haulers and pull trailers came through the Jenner area. it's doable if you plan on staying along the Sonoma Coast but forget about sight-seeing while driving. If your destination is to stay along the Mendocino coast and travel north, come across from Willits into Fort Bragg.
2015 Host Mammoth triple slide w/ TorkLift Fastguns
2015 Ram 5500 SLT cab & chassis with Douglass 9' utility body