California National parks

Redwood first - We were in the area again about a month ago. Lots to choose from. Refer to one of the RV park review sites to narrow it down. We park our 37'er at the best full-hook-up sites we can find & then drive the dinghy. In Crescent City we stayed at Shoreline right on the bay. Watched sea lions frolic within 50 yds of our window. From there you can access the northernmost redwoods. We also checked out Mystic Forest in Klamath. We will use that at some point. Prairie Creek is great, but I do believe it is a drive recommended for 4wd to get to Gold Beach. And the road was closed due to a landslide while we were in the area if we're talking the same place. We accessed that area from Azaela Glen RV in Trinidad. Excellent. Ancient Redwoods south of Eureka is one of our favorites, but it was closed for the season during our visit. River Walk in Fortuna would be my second choice for the area. These two allow for access to the Avenue of the Giants.
For Seqouia we last stayed at Country Manor in Visalia. Not much to choose from for bigger rigs in the Seqouia/Yosemite area. Once again, check the review sites to see what fits your needs.