[BAZINGA]

Shaking/vibration in a new car is almost always tires/wheels. Put it in a heated garage overnight and the ice will melt. (most likely cause). Or there is a bent wheel or bad tire.

I wouldn't call Volt's wheel/tire combination any more 'fragile' than other cars. Once you get to 40's , 30's etc. there is much less tire before the rim gets hit.

I agree, as a Cheese Head myself frozen snow/slush/ice cause out of balance conditions all the time. Maybe the OP is a transplant from Florida ha ha