We have always considered our RVs as an emergency shelter in case of a disaster or other event like your son's accident. It is always stocked with essentials and enough clothing for a week. I even keep the freshwater tank full. Since we live in earthquake country we have always said that if we couldn't live in the house or get to the house the RV would be the next choice since it is stored nearby but away from anything that would fall on it.
We do have 2- 2000 watt portable generators at home that can be used in the RV plus I keep a 1500 watt generator in the RV to use as a battery charger if I don't need the bigger generators.