Renting my rv

Most outfits that rent out RV's make the RENTER provide coverage. Most renters do this through their own existing insurance company- that's what I did when I rented a Class C back east for a few weeks. If prospective renters can't provide such insurance, that's an excellent heads up to you that they're probably not responsible enough to be trusted with your rig.

Surely your own agent can help you with coverage that protects you when you're using the rig, and can advise you as to what kind of coverage you need to require of renters that will fully indemnify you (and your own insurer) against all/any risks.