I did think of using a 4x4 or 6x6, and wrapping the chain around that. I would imagine if I spanned the load across the joists maybe 10'-12', and anchor the wood beam, that I may not need more support from below ?
I do have four weight jack's in the basement from when we had a 200 gal. reef tank in the living room. Can you say,...... WEIGHT ! lol
They worked great.