Having helped clean out a few storage units, I strongly suspect that a majority of what gets stored in those places never moves until it gets discarded or given away when the unit is cleared out. Almost always in the cases I've seen, the storage bill far outweighs the value if the items.
IMHO the only time a storage unit makes sense is when there is a short term need with a finite timespan and a well thought out plan for dealing with it. We used one once to deal with an influx of stuff from a deceased relative so their house could be sold but we decided ahead of time it would be for no more than 3 months and then set right to work going through things deciding what to keep, what to sell and what to give away. I've known multiple people though who clean their house by piling stuff in a storage unit with no long term plan. Then pretty soon there's so much stuff in the storage unit that they don't know what's there and can't easily access most of it.
That is similar to what I fear is going to happen.
I get the impression from the unpublished-video in this thread, that Fran, is (sadly) in denial of this situation.
They really need to NOT have a lot of the stuff. There are all sorts of ways of getting it to a good home or disposing of stuff.
I'm too far away to help (directly), and would probably not be the right sort of person, to be able to help, either.
But they just seem to have far too much stuff, and don't seem to properly realize it.
Without a massive home or workshop, they are going to get into big difficulties.
I think the real problem here, is they have way too much stuff. If they had a normal amount of stuff, like most people. This would be an easy problem to sort out.
Find a new rented or bought place and spend a day moving the stuff into it. Problem sorted.