Our overall length is shorter than yours, 40 foot plus tow car, but just a couple of months we left Olympia went to Forks around the north side through Sequim and down hwy 101 to just north of Crescent City and have previously gone down to Petaluma on 101. I don't see a problem for you using 101 (stay off CA 1). That's just my opinion.
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler