Progressive RV Insurance
I researched the different companies and ended up going with Progressive. Total cost for the year with the more high-end liability coverages (250/500/100) and low deductibles ($250) was only $656. My policy with Liberty Mutual was $2,347/yr, so quite a savings. Thanks to all for their recommendations.
GEICO was very competitive as well, $670/yr., but not quite the same level of coverage as Progressive. In addition, Progressive let me do everything online, while GEICO had to respond via e-mail with a quote (I guess that maybe they are having a human look at it first). And yes, I do realize that RV insurance varies greatly from state to state, based on planned usage and the driver history (neither of us have had any accidents in the past 5 years).
I checked with Liberty Mutual and the RV will be covered under our $1M umbrella policy as long as the same coverages are being used (hence the more high end coverage).
Thanks to all for your feedback. I know it sounds like a commercial, but I just saved a whole bunch of money by switching...