Explorer RV is a National Interstate agency. Definitley one of the places you should get a quote. Some other agencies that specialize in RV insurance are Miller's and Gilbert's - they can help you find good coverage at reasonable prices.
The point is to get several quotes and make sure you are comparing apples to apples on coverage vs price. If you are not familiar with the various components of insurance coverage (liability, collision, comprehensive, personal property, trip interruption, etc.), ask further questions, both here and of the agent giving the quote.
For example, "personal property" covers things you have added to the RV as well as your clothing and camera. Examples might be a GPS, a tow bar, vent covers, etc.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL