Let Geeks Be Geeks
FEMA didn't know how to provide communications but the geeks used Katrina aftermath as wireless proving ground
A small wireless Internet provider, a networking class at the Naval Postgraduate School, and techies from all over managed to re-connect people while millions of dollars worth of government equipment sits gathering dust in warehouses.
Off-the-shelf you can get a satellite Internet connection for your RV. This is electronic so a solar-charged battery system can easily power it if nothing else is available.
FEMA had this kind of thing in a trailer that they towed in when they responded under Witt.