>>511124037We've got drones on the farm that can hoist around 450kg, around a 1000 pounds in burger units.
Every bit as noisy as a chopper though so it wouldn't exactly be sneaky going back and forth sling loading spics over the wall.
Worth keeping an eye out for blokes doing big deliveries of narcotics though. Half a ton in one trip straight into the back of a dump truck etc is probably pretty viable.