300kg is simply not achievable on late model Australian plated Touaregs. You'd certainly exceed the rated max TBM, and even with 1 person and limited fuel and no other vehicle payload, likely exceed the rated max RAW. There is no available TBM or RAW weight upgrade.
The only way to tow a 3T van with a 2022 Touareg is to manage the TBM down to the max allowable 260kg, and strictly limit what's in the vehicle to ensure max RAW is not exceeded. Depending on whether it's an Elegance or Rline (which is a bit heavier with the RWS and active stabilisers), you may have some available vehicle payload beyond 2 people, but it would not be much. Also, you don't have to carry full fuel, which can be traded for vehicel payload.
260kg is 8.6% of 3000kg. There is any number of vans sold with tare TBM/ATM percentage well under that that get towed empty quite safely. Here's just one popular example - the 21ft 3000kg ATM Snowy River SRC 21, with a tare of 2310kg and a tare TBM of 160kg, or 7%
But, that phrase 'general engineering consensus' is a matter of opinion by the author of the article. It is certainly common practice and referred to as near holy writ, but there is no specific engineering data behind it - it is accepted wisdom for Australia but would be laughed at in the EU. And while most EU caravans are a lot slimmer, as the article states, than the current offerings in Australia even full-fat EU caravans are operated with low TBM - this
3500kg max Airstream has a max TBM of 150kg, giving TBM in the 5% range. It would be absolutely towable by a Touareg CR. And this is in probably the most heavily regulated motoring environment in the world.
IMO a better constructed article re ball weight and stability is this one
Towball Weight and Trailer Stability. Importantly it refers to actual research, of which the most comprehensive was done by University of Bath
https://www.clubtouareg.com/attachm...s/an-experimental-investigation-of-car-trailer-high-speed-stability-pdf.253543/
