- The construction involved taking the cab from the lorry chassis and replacing it with a concrete one.
- In addition, a pillbox of 6 inch reinforced concrete, 12 feet long, 8 feet wide and 5 feet high was placed on the lorries flat-bed.
- Access to the pillbox was via a trapdoor in the wooden floor.
- Use of this primitive vehicle was mainly by the Home Guard for airfield defence. However, some were possibly in service with the regular army.
- The crew of the Bison consisted of two men in the cab and up to three riflemen squatting in the cramped pillbox.
- It is significant to note, that, due to the varied chassis required, no two Bisons would have been the same.