an option i would exercise - if at all possible - would be to have a large metal shipping container - like used on container cargo ships - dropped on the property. possessions could be stored inside and secured onsite.

they come in various sizes, depending on your needs.

i'm sure you have someone in the area who can supply you one.

from experience, the 'pods' are $$$$. old, beater containers are less pretty and less $$, but just as secure. supply your own lock.