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5Tonne? How many commodores are you driving at once?Would those sand recovery tracks be enough to get some extra height to get the jack under? Or there is low ramps made of plastic (5tonne rating) to get the car up a bit. Lifts it by about 80mm.
Not a cheep option but you could get some quickjacks https://www.quickjack.com.au/car-hoist-systems/bl-5000slx-portable-car-hoist.html
They go from 73mm’s up to 447mm’s
Yep, will only get just over a litre in the diff, so 1.2 - 1.3 would be correct
Diff oil stinks and will look quite dirty - I've changed my ve out twice and looks dirty as hell each time