Loot stealing/sharing/distribution/entitlement etc... is the single largest cause of strife on the server.
Fairly frequently Cargo Plane's, Heli's, or with Bradley there seems to be some sort of preemptive claim to loot or some sort of issue with disbursement of loot. This has been discussed in Discord, but I've yet to see it make it's way into any published source. I.E. Server description or forum sticky. It seems like it should be a fairly basic thing however, it is not. It's led to many server community issues and led to more than a few players no longer engaging in group activities or even bothering with the above mentioned events. It also beings in game chat and bleeds over to Discord when there's no clear way to resolve the conflict.
Sticky Forum post or server rules... Add to server description loot sharing/disbursement. It's at least a start and people can't claim ignorance as a defense.