user: Question: What's the model designation of the model with GVW of 2828/2.78 kg/ton and axle ratio of 9/47?
Columns: ['Model Type', 'Model Designation', 'Engine', 'Wheelbase (mm/inch)', 'GVW (kg/ton)', 'Axle Ratio']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['CF220', '97100', '1759 cc (107.5 cu. in.) gasoline', '2692/106', '2235/2.2', '8/37']
SQL:

assistant: SELECT "Model Designation" FROM "Table" WHERE "GVW (kg/ton)" = '2828/2.78' AND "Axle Ratio" = '9/47';