Question is in the title - if anyone has experience working in a bakery that would be great. Thanks! 
Most small bakeries use small rotary mixers (like a Kenwood that stands as high as a man) that handle batches up to about 100lb - using a dough hook for bread.  The really big bakeries use trough mixers with blades that turn along the length of the trough. A typical batch is around 600lb. 