I am still checking marinas that allow liveabords. Looks like baot slip and place to store the boat trailer will run around $200 per month.
I think the boat could provide you with a decent shelter and a place to keep a lot fo your things. Not a bad idea, and I do note you have a had one. But when you put it someplace, think about the facilities for hygeine too. I think being able to get to some facilities would be key, so you need not pump out your tanks too often.
Hang in there.