Comprehensive car insurance covers damages from an "act of God," or events that are not caused by a car driving into something else. An "act of God" can include things like damage from a heavy tree branch falling on your car. Since you have no control over when or why a tree branch would fall on your car, this kind of accident would be covered under your comprehensive policy.
Basic coverage — which is required by law — offers you protection for personal injuries and damages to the vehicle, but it won’t cover extras like your belongings inside. If you live in your RV full-time, it might also be a good idea to invest in additional protection that covers your housing expenses or RV replacement costs. Before shopping around, draw up a list of necessary coverage options and make sure they’re offered by your prospective provider.