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_19908313_2 ( _number INTEGER, crew_chief VARCHAR )

### Question ###
What is the number of the truck that has the crew chief Billy Wilburn?

### Accurate SQL ###

SELECT MAX(_number) FROM table_19908313_2 WHERE crew_chief = "Billy Wilburn"