Giving a lift to a coil sprung vehicle with ESC would have exactly the same issues and lane change testing by the aftermarket industry of numerous vehicles has shown this not to be an issue and remain very stable. In fact many commercial vehicles will spectacularly fail this test.
Fine Dave, it is your choice whether to fit or not. It should also be your choice to engage or not and adjust driving to suit. Most manufacturers allow you switch off the ESC anyway.
It is more dangerous to have low tyre pressures or worn tyres.
The Toerag which is basically the same as the Porche will do 70kph in off-road height.
The normal road height of the D3 is too low for deeply rutted tracks where you have to travel long distances (some have suffered severe underside damage). Off road height gives better clearance than most 4x4s but something in between is what is needed. In most situations you can adjust your driving to suit but there are some situations where it is not desirable or practical. This is the gap in the D3s ability to be an outback tourer and where some will go for a coil sprung Jap one instead.
It is a matter of marketing. Vehicles are tested for only those speeds which suit the product to the main markets. This is only an issue in Oz and SA and we are too small a market for them to bother.:(
