State Farm will allow you to reduce coverage while in storage or for no particular reason. Just don't cancel the entire policy because it takes them a lot of legwork to get it back through underwriting.
Essentially, it is an automobile policy and you could just keep comprehensive coverage which is used for hail, wind, theft, vandalism, and fire.
I have State Farm, but my policy is for a travel trailer which only covers comprehensive and collision.
Your motorhome policy probably includes liability, personal injury, comprehensive, collision, uninsured motorist, towing, but double check with the office that you use.