If it were me, I would not do it. For many reasons. If and when my sibling were to call, I would say, "No, I cannot help you." Other folks here on SR are even more blunt about it: "'No' is a complete sentence."
Honestly, I have learned that once they have passed a certain point, anything you do to help them, really hurts them. With my brother, just TALKING to him was enabling him to continue to think he was "right," and that everything was OK.
Living in a storage unit does not sound that bad to me. It's not ideal, and people are not supposed to live in them, no, but those things are usually concrete buildings. Many people in the USA live in tents, and shantytowns believe it or not.
I never knew peace or serenity until I turned completely away from my brother and let him sink or swim on his own. Funny, when I did that, not only did I find peace and serenity, but he got clean and sober too.