As far as I can tell AC wants the input for car.ini as INERTIA=width,height,length (whole vehicle values i.e. not track,height,wheelbase).
At least that's what every good mod seems to use (except in cases like the AC Cobra which uses a lower height value in car.ini. I assume that this is due to the fact that it doesn't have a roof and the windowscreen would only count for 1% of the cars overall mass or something).
Nah he gets paid by Audi and Toyota for his other racing. He is driving for free (so was Koba). He has driven for Kolles (Tech. Dir.) before though and was teammates with Albers (Team Prin.) in that drive.
The total weight transfer equation is always true irrespective of suspension design and damping. Stiffer roll bars increase the lateral load split (i.e the difference between the force applied to the outside and inside wheels)
For an example, if you put a stiffer rear anti roll bar on, the calculated effects for a right hand turn using just sprung and unsprung mass calculations would be:
LF load decrease
RF load increase
LR load increase
RR load decrease
Your overall load transfer from mah/T would be the same, but a larger percentage of that load is applied to the left rear tyre along with the rear transferring more total load than the front. (due to the load split decrease on the front and increase on the rear).