We use USAA for all our insurance needs including our TTS & 5ers, but when we called to have our class A covered they put us on hold and connected us to Progressive. Thus far they have been very responsive to our needs and service has been on par with USAA, my DW takes care of our insurance policies and I can't recall why USAA didn't cover our motorized RV when they had no issues with our towable RVs.
We had an issue where our auto park brake failed locking the driveshaft about 30 miles from home, we called Progressive and they did a great job finding a tow company to tow our 39'+ rig home where I could make the repairs, the entire time they kept in touch with calls and texts providing timely updates and to check progress of towing company service.