The most sensible explanation and one that is beginning to pan out after 20 mins. searching is that these are set up for migrant workers.
Many who pick strawberries outside San Diego sleep outside in makeshift tents.
Raisens are a big crop in Caruthers where the picture came from.
Here's this article: https://www.peoplesworld.org/article/the-true-conditions-of-farm-workers-today/
No search engine has any decent info that I see..but migrant farm workers seem to be the correct
answer.
I want to know the thoughts of God. Everything else is just details.
A Miracle is when God makes His Reality our Experience