Some have emergency totes sitting at the door, with meds, prescriptions, glasses, computer hard drive back ups, insurance data, stuff like that in them.
Some campgrounds have "emergency" plans. Not sure all do. Ask what they are. Where is there a safe place? I have had campgrounds refuse to tell me. Ya, that made me happy. NOT!
See if there is a school nearby that is designated emergency shelter.
And, where there are no basements, well, I just don't know.
And, at night, who knows what you are driving into, or driving away from. Also the rain encased tornadoes, very hard, if not impossible to see.
Mother Nature is a tough ole broad.
None of my ideas are worth much.