Not sure of JQs policys but Tassie ports I imagine would be tanker sectors - tankering fuel is loaded - last minute boost of pax numbers would have them put them overweight on max landing - choice of pax or baggage. De-fuelling is rare as rocking horse poo these days, as mentioned before it has to be put into another company aircraft, refuelling companies never really keen, unless they stuffed it up in the first place !