I always add the disclaimer that it's all about how comfortable you are with driving your rig. Yes, I understand the road may scare some people. If you're afraid of tight corners and high cliffs, then stay off Highway 1. But that's up the individual to decide. Don't come on here and tell everybody else that just because you can't do it, that nobody else can either. Motorhomes drive down Highway 1 all the time, especially the stretch South of Monterey. Now Highway 1 does get more windy and more steep north of San Francisco, but it's still doable in an RV. I would however recommend if you schedule permits, to not do Highway 1 on weekends, as there are a lot of day trippers out on the weekends. You would be more comfortable in lighter traffic. And I also recommend that if you're only going to do it one-way, that it's best to go from North to South. A lot of people claim not to do that because you're on the cliff side. But you're also on the ocean side and that side of the road has the most turnouts which are important to let other traffic pass and to pull over and enjoy the view.