Table schema:
CREATE TABLE table_12791809_1 (super_b_capacity_reached_ VARCHAR, _citation_needed_ VARCHAR, number_of_truck_loads_north VARCHAR)

Question: When was the Super B capacity reached when the number of truck loads north was 7735?
SQL: SELECT super_b_capacity_reached_[_citation_needed_] FROM table_12791809_1 WHERE number_of_truck_loads_north = 7735