We,too, just got a renewal from Progressive on our MH and after 9 years, no claims, and earning 0 deductible they want to raise our rates by about 33%. We have had no other claims on my other vehicles and no tickets by my wife or me. We also have impeccable credit as my wife is a CPA and insists on it.
Our agent suggested Allied as we already had it on our other vehicles. Their coverage is much better than Progressive and about the rate we had paid previously. The only downside is the agreed value we had with Progressive will be reduced to book value. Progressive told us everyone in our state was being given the same kind of rate increase. Guess Flo needs a big raise!
As far as the credit score goes, the reasoning is that if you have bad credit you are probably more careless and a higher risk for a loss.