We had the same issue with State Farm on our first class B. They didn't know what a PleasureWay was. So then we went with Progressive who had MUCH better coverage than State Farm on an RV. We didn't stay with Progressive when we traded our PleasureWay, (in 2009), as they were too high.
Just yesterday got a quote from SF again on our new Winnebago ERA. They knew what this one is, it was in their computers. The quote for the same coverage line by line was just short of double what we've had the last 3 years with our current RV insurer. Allied Insurance RV. Got a quote from Progressive also and they were $175.00 higher than Allied. These were quotes for 1 yr. coverage.
We do have State Farm on our cars and are very happy with them on auto coverage.