Just an experience:
For two years, up until this week I had insurance through National General. Like before I went online and selected payment for renewal, but to my surprise instead of a "Thank you for renewal." and continued coverage they took my payment and I was instructed to call their Sales Department. Huh?
I called their Sales Department and was told that they will not insure my bus. I asked what had changed and I was told that their underwriters had made changes to their requirements. No big deal, but now I need to hassle them for a refund.
I then called Progressive Commercial and obtained a commercial for personal use policy. I should have done this in the first place. Better liability coverage, no questions asked, and cheaper.