Increasing track width equally f/r won't change oversteer/understeer. It would, I guess, change the feeling of stability by changing the roll center and thus body roll.You're missing the point... The wider track creates more stability, regardless of body roll or not. This is not rocket science. He's achieving a similar feeling through a turn by increasing track width. Theres a reason hardcore Jeeps run wider axles. Stability is one of them.