CLs are certificated locations. Many are established by the CAMC. They can only accept 5 vans, caravans or motorhomes. CSs are certified sites, regulated by the CCC also 5 Vans but also some tents. For CSs you must be a CCC member. For CAMC CLs you must be a CAMC member. But there are other CLs regulated by Motorhome fun, aka Jim, and also by the Motorhome Club. Both allow nonmembers to use, but still 5 van sites.
It is worth exploring the website/app search for sites which allows you to filter on these sites.
It is worth exploring the website/app search for sites which allows you to filter on these sites.