Before I got my PQ1500s (9” throat) I quilted large quilts on either my vintage Brother or my PC420PRW bother have throats in the 6to 7 inch range. Puddling or accordion folding are the way to go. Also Make Sure you have good support to the back and to the side of your machine, you do not want to have to deal with any quilt drag on a larger quilt, it will wear you out and will also result in ugly stitches whether FMQ or doing quilting using a walking foot or your regular foot.
Rob