If you have a good hydraulic Jack, who needs any other jack under a car
, it's not like your working under it is it?.
I changed my X6 wheels without all this special tools lark, just jack it up on the plastic bit and away you go.
Yes the wheels can get heavy the X6 wheels were 44Kg each, but you juggle the jack hight till the wheel only just touches the ground and ease the wheel into place. Then just bolt it up, I torque all my alloy BMW wheels too 120Nm. Never had a problem.