I have two 9" throat machines and I do FMQ - large stipples or just meander quilting on them all the time. I have done large quilts. It is a challenge on any over double size quilts but after the center cross it gets easier. I then divide the quilt into quarters and do it like that. I have many pics of my quilts on this board. I don't do any fancy quilting, just not for me.
A long arm would be much easier but I don't have room for one.