Thingfish pretty much explained it. All I can add is it works. Everything hung cooks very evenly. Only thing I've noticed is with ribs if the tip is closer than about 3" to the coals the first 1/2" will get over cooked. But it's actually still good. I just keep that bone for myself. My cooker will stay about 275 as Thingfish stated. I haven't made a brisket yet but I'll let you know how it goes. Probably cooking it up Sunday.
Great info Guys! Thanks!