Yes, depending on the road. Some are small hilly dirt/gravel roads that are definitely not appropriate for towing vehicles. You should do your research first.
YES
On the main roads I saw this size...
Probably. Limited to main roads but totally do able
Don't try to take anything other than major roads. As a former Ranger, I can tell you that it's easy for RVs to get stuck. Especially if you're towing something! Even Highway 101 is kind of exciting in an RV - very hilly, very curvy. Be safe!
all of the roads we drove on were wide enough to drive. but two of the trailheads were at the end of a dirt road, were it would be impossible to turn around.
The roads are not possible to take your RV on should have signs
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