I've never had AAA for insurance. But let me relate my recent experience with National General.
We have used National General (through Good Sams) for probably 10 or 11 years to cover our RVs. With our recent change from the Newmar to the fiver we called to change coverage. Our car and motorcycle have been with Progressive for several years.
National General would not give us a policy for the new fiver. There reasoning was that two years ago we had a claim for a windshield on the Newmar that cost them $3,600, plus they were somehow able to see a Progressive claim where our car was severely damaged by hail about 18 months ago. Because of these two claims, one of which was not even through their company, they refused to offer us a new policy. So much for taking care of your long time customers.
We went with Progressive and bundled everything. It turned out a better cheaper option for us anyway.