Pick what the park did. Answer one question. See what California's Mobilehome Residency Law says, what to do, and who to call.
Written in English for the manager. Fill in your info, copy, sign, and keep a copy. Send it so you can prove it was received (certified mail or hand-deliver and get a dated receipt).
You get the law, the steps and the letter in one email. Ken can point you to the right office. No spam.
408-666-2825 Many people get this wrong: "It's the park's land, so they can make any rule they want." No. A park is run under the Mobilehome Residency Law. A new fee slipped in through a rule change is void, and the park can only end your tenancy for the reasons the law lists.