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Trucking equities joined the rest of the stock market in going through sharp volatility this year — improving, crashing and then clawing their way back — so that as 2011 drew to a close, six key indexes had moved less than 8% up or down over the course of 12 months.

Most trucking stocks joined a rising stock market through the second half of 2010, counteracting a jittery first half, as profits climbed at the majority of publicly traded carriers.