Seems that ego and enjoyment of slight risk are a part of this discussion. I have driven #1 in a 23 footer and encountered hairpin turns where your rear end overhangs to other lane. Some of the scenery on US 1 is nice but a lot is rather desolate looking. US 101 is easy to drive with many small seaside towns and some really beautiful and famous redwood forest with nice state and US forest camp sites. There are usually road repairs every so often on US101 and some twisty areas that will need your attention. If you are an aviation fan, the Evergreen air museum is worth an inland diversion to McMinnville OR, the Spruce Goose and lots of other aircraft are on exhibit there. Tillamook air museum is nice but old and limited in aircraft, was a Navy blimp facility during WWII. You might like to stay at the KOA ranch RV park in Petaluma, CA, has shuttle service to San Francisco tourist attractions. Call ahead.
http://www.evergreenmuseum.org/