The SS-Sonderkommando "Lange" was supplied with two vans initially, each carrying about 50 Jews gassed en route to the forest.[1] Later on, Lange was given three gas vans by the RSHA in Berlin for the killing of greater numbers of victims. The vehicles had been converted to mobile gas-chambers by the Gaubschat company (de) in Berlin which, by June 1942, produced twenty of them in accordance with the SS purchase order.