Looking online max payload on a 47 is 3800 lbs more or less. Given how things creep on planes it wouldn't surprise me if it was at least 200 lbs less.
They took on 150 gallons and would have had at least 75 ? on board when they landed. So I suspect before anyone stepped on board they had maybe 2,200 lbs to play with, 2500 max. 12 people with winter clothes will use that up without bags, guns , ammo or loot. I have never done a W&B on the PC but I was told it has a good envelope.
The NTSB will get a pretty good set of numbers on it but they must have been very close to max weight.
20driver