Updated from 11:46 a.m. EDT

Shares of National RV Holdings ( NVH) were among the NYSE's winners Tuesday after the company posted better-than-expected second-quarter earnings and sales.

The recreational vehicle manufacturer earned 24 cents a share on sales of $126.4 million. A year ago, it posted a loss of 35 cents a share on sales of $73.5 million. Analysts polled by Thomson First Call had expected second-quarter earnings of 13 cents a share on sales of $115.4 million. The company said a healthy economy and robust industry demand fueled the strong quarterly results. Shares of National RV Holdings traded up $1.56, or 11.4%, to $15.29.

Tower Automotive ( TWR) fell after it reported mixed second-quarter financial results and warned that third-quarter earnings and sales would fall short of expectations. Excluding items, the auto-parts maker posted a second-quarter profit of 3 cents a share on sales of $783 million. Analysts had expected it to earn 3 cents a share on sales of $820.4 million. Looking ahead, it forecast a third-quarter loss of 18 cents to 22 cents a share on sales of $725 million to $735 million. Analysts had expected it to post a loss of 2 cents a share on sales of $819.4 million. Shares of Tower Automotive traded down 14 cents, or 4.1%, to $3.25.

Shares of Cherokee International ( CHRK) fell after the company posted weak second-quarter results and warned that third-quarter sales would fall short of expectations. The power-supply products maker earned 22 cents a share during the second quarter on sales of $38.6 million. Analysts had expected it to earn 25 cents a share on sales of $39 million. Looking ahead, it warned that sales would be flat to down slightly vs. the second quarter. Analysts had expected it to report sales of $39 million. Shares of Cherokee International traded down $2.22, or 19%, to $9.48.

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