If your heading to private parks you will have no problem. If your into State parks you need to consider length. The older CCC (Calif Conservation Corp) parks from the depression have very short max lengths. Up in Angeles Crest 24ft and 26ft max are common. That represents the depth of the site, so park your trailer and move the car elsewhere. Although many State parks now accept larger rigs the number of spots available for larger RVs can be greatly limited. We like private campgrounds, just our thing. In 30+ years of camping up and down the State we have never been denied a spot based on length. We travel 39ft plus a tow car.
Hope this helps. Happy Trails.