Hittin,
Ditto what Bernie says. I got my policy from RVProtection.net but they too are brokers, not insurers or even agents for an insurer. The insurer for my policy is American Guardian and I have no complaints at all (but only one claim so far).
Don't worry so much about the broker but do payatention to the deatils of the policy offerred. You want an all-inclusive policy - one that covers everything except specifically excluded items. That cuts way down on the potential for a debate over wheher some item is covered or not. Decide whether you want full coverage, drivetrain onl, etc., and what deductible you are comfortable with. A low or no deductible policy will cost much, much more than a high deductible. We went witha high deductile ($200) becuase I do mostrepairs mself and wanted coverage only for big ticket repairs. For those who take most repairs to an Rv dealer or chassis service center, a low deductible might be a better choice.
Lastly, make sure you understand the procedures for making a claim and follow them religiously. You will get no slack from any insurer, no matter how reasonable your excuse may seem to be.