Olympic Peninsula, WA - all NFS sites 21-foot limit?

We spent a week in the Klahowa NFS CG with a 31 ft fiver last summer. No reservations but squatters start filling it late in the week for the weekends. Very much like the Rain Forest. The only time I had to use the gen to boost the batteries one morning. (solar usually handled it). Right off 101, about 15-20 minutes from Forks. A number of large sites.