i am a fan of hammock camping and generally the first to advocate it.
But, having lived a few years in Tas and done plenty of walks (including experiencing being holed up with the blizzard trying to blow you off the mountain / kill you - when it should be sunny and is summer) - i would recommend a tent.
If you were really keen for the hammock in Tas - maybe the east coast or if you were sticking in lowland / forest areas only (being of the soggy ground may be some advantage in some places).
Agree that the cold hammocking in the USA is not necessarily a good comparison - Tas ain't that cold by the thermometer - but the combination of wet, cold, wind, the fact you are often wet and muddy after any walking and the extremely unpredictable weather (especially as you go west and up) makes that little bit of cold much harder to manage day-in day-out.
Come to the other end of Australia on the other hand and I reckon people are about as silly tenting it as those hammocking in Tas
