It's not impossible to machine quilt queen and king quilts on a domestic machine. Believe it or not, my first completely machine quilted quilt was an over-sized king size - nobody told me it was "impossible", so I just did it. You just need to do a lot of rolling and bunching, beginning in the middle and working outward. I've mainly done stitch in the ditch, but you have to start somewhere. You also need to pin-baste generously, using your fist for a guide (about every 4 -5 inches apart), as this cuts down on puckers on the back. I also use cotton batting, as it "clings" to the front and back of the quilt. Good luck.