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.

IMC Global ( IGL) rose after it reported better-than-expected second-quarter earnings and sales. The maker of farm chemicals earned 32 cents a share on sales of $748.8 million. Analysts had expected it to earn 16 cents a share on sales of $635.3 million. Looking ahead, the company said it remains "cautiously optimistic" that raw material costs will be lower during the second half of the year, as a result of lower sulphur prices. That should allow it to "capitalize on favorable market trends and sustain its improved performance during the second half of 2004." Shares of IMC Global traded up $1.46, or 11.9%, to $13.76.

Shares of Sonic Automotive ( SAH) rose after the company reported in-line second-quarter earnings and reiterated its full-year outlook. Excluding items, the auto retailer posted a second-quarter profit of 73 cents a share on sales of $1.88 billion. Analysts had expected it to earn 73 cents a share. Looking ahead, it expects to earn $2.65 to $2.80 a share for the full year. Analysts are looking for it to earn $2.59 a share. Shares of Sonic Automotive traded up $2.82, or 15.1%, to $21.52.

NYSE volume leaders included Nortel Networks ( NT), down 65 cents to $3.42; Lucent ( LU), down 7 cents to $3.08; Verizon Communications ( VZ), up $1.36 to $37.86; Cardinal Health ( CAH), down $6.47 to $44; and Elan ( ELN), up 4 cents to $19.87.

Nasdaq volume leaders included Intel ( INTC), up 30 cents to $23.27; Microsoft ( MSFT), down 22 cents to $28.44; Cisco ( CSCO), up 17 cents to $20.71; Oracle ( ORCL), up 30 cents to $10.38; and Sun Microsystems ( SUNW), up 8 cents to $3.73.

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