This looks like a great idea. Lifting one of the drive axles is going to save fuel and tyre wear, no trucking operator is going to say no to that one. However, there may be an issue translating this idea to Australian trucks. Our low front axle mass limits mean our turntables are set back further than they are on a typical European prime mover. A solution which comes to mind is the sliding turntable, moving the weight of the trailer directly over the drive axle still on the ground.
If the turntable remained in its normal position and the rear drive was lifted, it could lead to a situation like this one, experienced by a Scania driver: