Keeping my rig fully fueled and ready to roll after returning from a trip is at the top of my list. At first word of evacuation gas stations can be very crowded and after a disaster fuel may be unavailable at all. Hurricane evacuations are usually chaotic and trying to get gas before leaving is not something I would want to do. Two years ago we spent 4 days in the MH after an ice storm took out power and shut down roads. Nice to be able to sit comfy running the generator.
I also keep a full hard drive backup of my home computer in the MH away from the house. Lots of valuable information and photos that I don't have to worry about grabbing.