Hi Tony,
For the existing Touareg, try giving Bavaria Motor Tuning a call.
They are at Brendale.
I had few problems with my X5 recently going in to limp mode.
Many mechanics looked at it without finding the cause.
After a visit to Bavaria, they were quickly identified the problem relating to ABS computer.
The owner invested a lot of money to latest diagnostic tools.
3 months later my gearbox end up dying from an unrelated issue, Bavaria did the change over to a new gearbox.
Regarding to comfort on the seat related to Land Cruiser 200 Series.
Generally they are average seats, not designed as good as European competition.
The foam used is not the correct grade for long journeys.
We offer our Toyota customers TRD seat conversion. Basically using the existing frames/rails in your car and inserting TRD seat foams and custom leather upholstering it all. TRD foams are top grade.
Headrests are softer density for resting whereas base and back rests are higher density for additional support and comfort.
Pic below showing one done for a Camry,
Attachment 84863
I dont want this post to sound like advertisement, but rather information.
If you go LandCruiser way and not happy with the seats, give us a call.
Regards
Max Ungun