I think my batting is Hobbs 80/20 or its Quilter's Dream 80/20, similar to W&N batting if that helps. Its 43" in diameter at this writing and I don't think I've cut any if much off it yet. I have mine suspended on the ceiling over my cutting table so I can just roll it out over the table and cut it from there. As my sewing room is in the basement my ceilings are not tall, only 7'4" to the top. I bought some long hooks with an eye installing it into a 2 x 4 and then into the ceiling as I didn't want the long screw to go up thru my floor joists. I purchased a 1.5" thick dowel 64" long, added eye hooks to each end with a removeable clip gadget so I can release it when I needed to remove it. Even with 1.5" dowel the weigh still bowed the dowel a bit.
Here are some photos to show you what I did................