http://www.pecanparkrvresort.com/services.php
Pecan Park RV Resort in Jacksonville has storage. Not sure about the price. Lots of RV parks in the south offer storage. If I had room, I would certainly offer you a place to park.
We are not members, but the Elks Club has many locations that have RV hookups or parking. They are a service organization and might be willing to help if you joined their organization. Thoughts and prayers are with your family. http://www.elks.org/lodges/LocalFacilities.cfm#script_name#