The top of the compartment is closed and cannot be opened. Other types of refrigeration units with comparable power are available as options. Optional single side door, double side door, opposite door and other different forms of side door. No side door structure is optional. It can only be used on high grade highway. CM2XL-4S/2K(4S/2M) ABS control system produced by Guangzhou KORMEE Automotive Electronic Control Technology Co. The material of the side and rear lower guard is aluminum alloy, and the connection method is bolt connection; the main size parameters of the rear lower guard mm (section size: 80×150; ground clearance: 450).