There are a number of reasons I would advise against this. And by this I mean from Morro Bay north. RV’ers do it all the time, usually with a prominently displayed ‘El Monte Rents’. The first reason is that you will be a traffic impediment, as passenger cars will be trying to pass you in an area where it can rarely be done safely. Second is the ever present bicyclist who will be even slower than you. Again, you have to get around them, and then cars around you. Finally, the ‘Motor Carriers’ Road Atlas’, available at truck stops, definitely does not show the aforementioned route as an 18 wheeler route. Park the RV, take the dinghy. There are plenty of nice RV parks on 101.