It will be very heavy. Not just for warmth but weight wise. I think I would opt for a lighter weight poly batting which will give equivalent warmth but not near as much weight. With W&N, it will weigh a LOT when washing and could easily knock a top loader out of whack if not centered correctly. With poly batting I was able to cram a queen size into my standard top loader. And I live in the frigid Northeast.
Edited to add, you also want to consider that weight when quilting. Until I got my LA, I tied them. No way would I want to try and wrestle any size T-shirt quilt through my domestic.