Can you get hold of some heavy timber - say 10x8inches - as you could build a set of ramps to put the car's wheels to give you a few extra inches? Yes it does need to be level.

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Me:
Current: 2011 E71 40D Vermilion Red/Beige Nappa

Wifey:
Current: 2012 R80 Countryman SDX Green/Cream