Also depends on the state. I had my 2006 HR in VA covered by Hartford. USAA would not convert the travel trailer (MH trade in) into a MH policy. Progressive was way high.
When we moved to FL in 2015, Hartford would not move the policy unless I put my cars under them as well. Cars have been under USAA since 1985 so that wasn't an option for us. Good Sam found us a decent rate with Allied. They replaced the broken windshield with no fuss (came to us). In FL $0 deductible on windshields so it is a state thing and not an INS company thing.