While SKULabs sends complete shipment info to each carrier in the process of getting rates and labels, it's best to inquire with each of your carrier reps or local post office for more information on how to arrange scheduled daily pickups. Scheduled pickups skips the trouble of needing to notify carriers—just have your packages ready when your driver arrives at the decided time!
Note: Some carriers may charge/waive varying fees associated with pickups or may even require certain methods or creation of pickups through their website. Check with your reps regarding any unique carrier specific rates or requirements they may have.