One would think the CNSPOM sector would be a goldmine for Northbound cargo, even handling overflow moved on domestic flights from Southern ports to CNS and onforwarded so therefore:
DH8-100/200 series - marginal and little or no cargo capacity above baggage.
DH3 - Multiply the problem by 4 and just load the Captains lunch.
B717 - Tas Melb routes are offloading baggage like there in no tomorrow and cargo is not a consideration with any kind of holding.
142- Possible, as cavernous holds. MLW the first problem that springs to mind with holding and alternates.
143 - Also possible, but multiply your MLW problem. ZFW problems with full load and centre wing tanks full if fitted.
B733 - Now we are talking. Fairly bulletproof aeroplane and this is my call for the route. Capacity, range, weight performance and nice big holds.
Just one groundhogs view of the situation.
Please feel free to pull these suggestions to pieces at your leisure, as I will be interested to see if I am close to the mark.
Best regards
EWL