What is the total number of pounds being transported for S K L Enterprises Inc?
"S K L Enterprises Inc" is the cust_name; total number of pounds refers to Sum(weight)
SELECT SUM(T2.weight) FROM customer AS T1 INNER JOIN shipment AS T2 ON T1.cust_id = T2.cust_id WHERE T1.cust_name = 'S K L Enterprises Inc'