Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23978 ( "Model Type" text, "Model Designation" text, "Engine" text, "Wheelbase (mm/inch)" text, "GVW (kg/ton)" text, "Axle Ratio" text )

### Question ###
What's the model designation of the model with GVW of 2828/2.78 kg/ton and axle ratio of 9/47?

### Accurate SQL ###

SELECT "Model Designation" FROM table_23978 WHERE "GVW (kg/ton)" = '2828/2.78' AND "Axle Ratio" = '9/47'