Most TOL machines have at least an 8" in one direction hoop. The Pfaffs and the Vikings probably have the largest - even the 2170 has a 12x12, but you have to split the design and flip the hoop not rehoop. Brother and Babylock did have 8x8. (Might be larger now)
I've got a 5x5" hoop on the Pfaff that will do a decent center. Newer machines have larger.