Yes to the "pick two of" statement above.

The only self storage units I have seen that are not card controlled and fenced have been very rural. Some of the ones in really isolated and small towns don't even bother with perimeter fencing.

They would hardly qualify as convenient for most people though just because they are so remote.

It does make me wonder about the possibility of parking a small van body truck or trailer somewhere that would be more accessible
to you. Possibly in a garage space or parkade. Maybe in a friends yard or driveway.
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May set off to explore without any sense of direction or how to return.