Drove to the upper area with 35 foot 5th wheel and you need 4-wheel drive.  A bit dicey in one area but worth the trip.  (There is a sign coming off the main road for any RV longer then 30 foot to got the the next site up the road another mile.)  Host at site did not say anything about our stay (3 nights).  A bit smoky due to forest fires in CA, but great sights/views early in the morning.  We stayed two nights three weeks later as we headed back south.  Stayed in lower area and it was also just as great, although views not as nice.