The largest labor camp by far was Auschwitz, supplying up to 70,000 laborers every day to Siemens, Krupp, Farben, and many other industries in the area. These industries were crucial to the Nazi war effort. See a photo of the Farben plant near Auschwitz here ...
http://www.holohoax101.com/103/
Odd place to kill 10,000 Jews per day right? The holohoax is absurd on its face, it depends on total ignorance of the facts.
As for being equipped for efficient mass murder, have a look at the hoax gas chamber at Auschwitz here
http://www.holohoax101.com/, built by the Soviets after the war ! Completely absurd.