Truck Refrigeration Units Catalog. C-200 for 2- 10m³ Truck Box. C-300 for 10-15m³ Truck Box. TR-200 for 6-15m³ Truck Box. TR-300 for 10-20m³ Truck Box. TR-350 for 15-25m³ Truck Box. TR-450 for 16-22m³ Truck Box. TR-550 for 25-35m³ Truck Box. TR-650 for 35-45 m³ Truck Box.