Can you recommend insurance companies for parks?

I have three parks on one policy. I just got a notice from my insurance broker that because of one claim on one park (a frivolous slip and fall claim that I don’t even know if was paid or not - my first claim in eleven years, by the way) my premium on the entire policy is increasing.

It’s enough reason for me to shop around.

Does anyone have any recommendations of insurance companies I could call for my communities? Thanks in advance.