My bank handles my insurance and every year they compare rates from all of the major companies. This year when they gave the Progressive quote it was noted that they went up from the previous year, write RV policies for only six months, and will not issue COLLISION insurance on any coach over 10 years old.
That said, the rates also went up with Hartford, State Farm, National, and all of the other companies they contacted, from the previous year.
I stuck with the same insurance company I used for the last two years and their rates did increase $35 of last year but they write one year policies for all of my vehicles and they were still way less expensive than the other companies.
Progressive was the most expensive.