Progressive
Yes, Progressive Insurance is the way to go! I was insured with them in 2015 after every other insurance agent I called turned me down flat or didn't know what I was talking about. (Note that I'm insured with Progressive out of California.)
About 8 years ago, Progressive stopped insuring RVs in NC so I had to look for other insurance. Progressive kept me on the phone for an hour and a half asking questions (and I was smart enough not to use the "b" word, etc.) but they turned me down. NC has stupid state regulatory people who make it hard for insurance companies* in the state and companies are reluctant to take a chance in NC so maybe that has something to do with it. (They don't make it hard for companies to screw you over about claims but otherwise.)