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Ken, I encourage you to learn about roll centers, roll stiffness, and tipping. cars don't tip because they lean. they don't lean because they are narrow or wide.
they lean because of the torque created between the rollcenter and the center of gravity.
They tip because the torque created by the center of gravity about the outside tire.
Leaning and tipping are unrelated. If you make a car track wider, it will indeed be less likely to tip, but you can say nothing about how much it leans.
As for the rollbar, if I were to add 1.75 DOM I would indeed have a much heavier car.
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