Table schema:
CREATE TABLE table_13642023_2 (gto_winning_team VARCHAR, rnd VARCHAR, gtu_winning_team VARCHAR)

Question: Who was the GTO winning team in round 5 when the GTU winning team was #59 Brumos Porsche - Audi? 
SQL: SELECT gto_winning_team FROM table_13642023_2 WHERE rnd = 5 AND gtu_winning_team = "#59 Brumos Porsche - Audi"