Robofos,
It means flying over gross, you are not put under direct pressure to do it but everyone else is doing it, you know what I mean. And if you work there at some time you will do it what ever you think now. It can get quite exciting at times just trying to get and overweight out of CG 206 out of the white ark.
I think that Sefo are the best on this and as far as I know they even tie the cargo down so it does not kill you on impact.
The freight runs in Maun are normally just loaded in the aircraft loose behind the pilot and in the pod so when you make that forced landing you will probably get a slab of Hansa through your skull.