I had my commercial policy with Everest Denali for the first 2 years and this past year my broker found a better rate with Wesco Insurance Company. I also run through S Corp in CA. Hope you find a good policy for the right price.
Kevin,
I use the factory bolts but ran the threads out as far as possible, then turned them a few times each to try and get a somewhat equal distance for the clamps. See the photos for further clarification.