My mate and I just lifted it... I'm guessing about 80kg lift each (80kg would be easily my limit), so to answer my own question, approx. 160kg.

Thanks anyway guys.

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MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)