A ships prop shaft on a Sterling DC6 swing tail (do I remember that correctly? - long time ago) with no means of offloading it, so we came up with some sort of device with slings and pullys and a mobile crane, one end suspended from the crane (which could only lift half the weight) the other resting on a pallet dolly on 10 ton forklift that had to be weighed down with as many people as possible that climb on the back, all synchronised to move at the same time. Modern Health & Safety men would have loved it.
KAR-AIR Finland had a swing tail DC6 and I think Aviaco Spain had one for a spell. As far as I recall all Sterlings DC-6Bs were pax configuration.
SABENA did a couple of swing tail conversions to DC-4/C-54s but I think they finished up in The Congo shortly after completion.
Be lucky
David