I've used GMAC (Good Sam) since we bought our 04 Imperial. The policy isn't cheap but we get great service. We've had two "accident" claims against the comp and 3 windshields. The price has gone up a couple of hundred but not like Progressive did with our old Safari. I recently did a review and found that I could get a better price thru Miller ins but they don't do cars as a bundle. Also they couldn't do an umbrella policy in SD. I also noticed that the coverages would have changed losing my cost of replacement and purchase price coverage. I went back to GMAC and learned that I would lose that coverage if I changed providers or changed coverage with them and I could not get it again. I stuck with my original agent in Sioux Falls SD and also purchased an umbrella policy thru them. That policy covers me in the case where accidents payouts exceed the coverage on my policy. Not hard to do in this day of huge suits for damages in an accident. I'm also getting a dash cam. It also covers liability on our cabin, not just vehicles.
In the end my policy fees went up about $300 per year but I have far better coverage than I would have had if I changed. A note, If I had gone with Miller, my fees would have been within $50 of what I'm paying for MH, car, umbrella thru GMAC.
Ron