Had the same problem with my Vette, replaced the RunFlats with non-runflats, and the problem went away. Sidewalls on the Goodyear runflats are stiff as a 2x4, and caused the front and rear of the vehicle to bounce when going over expansion strips on a curve.
Same problem with my Jeep when I air up the Yokohamas to 35 psi or greater. Problem goes away with air pressure at 30 or lower.
Shocks could be a problem, but the stiffness of the sidewall, due to manufacturing or due to high air pressure can also cause the same symptoms.
Most vehicles are shipped from the plant with high air pressure; dealer is supposed to check and adjust pressure to the pressure noted on the tire pressure label during the pre-delivery inspection procedure (they are paid to do this by GM).
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Black Sheep Hummer Squadron
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