This thread reminds me of the Herc test flight shown in an episode of the '80's "Test Pilot" series, made at ETPS Boscombe Down.
One of the trials was to establish the max load that could be airdropped from the (then new) Mk3 C130K.
The load was a large earthmover of some sort, mounted in an airdrop rig.
Several times the load was referred to as weighing 30 tonnes....somehow I doubt that Albert would have even got airborne if that was the case!
Even so, the cockpit clip showing how much the control column moved as the load travelled aft was interesting!