CM .. some info here ..
https://www.facebook.com/JADTEU/app_214309071924895
"The Medium Stressed Platform (MSP) Reefed Mains Extraction parachute system enables us to drop 2x 18000lb loads as low as 550ft from Hercules C Mk1 or C Mk3 aircraft. The Heavy Stressed Platform (HSP) is used to drop engineer equipment up to 30000lb from a minimum drop height of 700ft, and a single platform can be carried in a Hercules C mk1. "
and a google on Hercules HSP drops (HSP = Heavy Stressed Platform) will find even more ..
Aussies dropping something a tad large ..
https://www.youtube.com/watch?v=PTHGHgqQsx0