Shopping around for your insurance is a safe bet. As a cattle rancher I have numerous types of insurance including RV insurance. Over the years I have changed RV insurance carrier twice, both times for increasing rates that seem excessive. in both instances I was able to get coverage for not only less than the increased rate by the old carrier, but even less than I had been paying before the rate increase.
I also advise checking the details of actual coverage for any policy before buying. The promitions and advertisements do not show the details and they are all different. Make sure you are getting the coverage that you need for price quoted.