From the information I got from someone who was present during the loading, the aircraft was overloaded.
Apparently the aircraft usually carrier 4.5 pallets but on this occasion, the loading master, who sadly also perished in the crash, insisted on 6 pallets. I'm told all the records are available.
The hypothesis is that on take off, the cargo moved to the rear of the aircraft setting off a chain of events that precipitated the crash.