Question: Among the menu pages on which the dish "Chicken gumbo" had appeared, what is the menu ID of the one with the biggest width?
SQL: SELECT T1.id FROM MenuPage AS T1 INNER JOIN MenuItem AS T2 ON T1.id = T2.menu_page_id INNER JOIN Dish AS T3 ON T2.dish_id = T3.id WHERE T3.name = 'Chicken gumbo' ORDER BY T1.full_width DESC LIMIT 1