To date no one has yet accomplished this feat.
Greg Biffle was the first driver to claim both championships. He won the 2000 Nascar Craftsman Truck Series and the 2002 Nascar Busch Series. The series sponsorship names have now changed.
Martin Truex Jr. was the last driver to win back to back championships in the Nascar Nationwide Series (2004 & 2005). It was then known as the Busch Series. Truex Jr. drove for Chance 2, which was co-owned by Dale Earnhardt Jr. and Teresa Earnhardt.
In the Nascar Nationwide Series, the driver with the most points accumulated after 33 races, is declared the champion.
Joe Gibbs Racing has won six Nascar driver/owner championships.2000 - Bobby Labonte (Winston Cup Series)2002 - Tony Stewart (Winston Cup Series)2005 - Tony Stewart (Nextel Cup Series)2009 - Kyle Busch (Nationwide Series)2008 and 2010 - (Nationwide Series owners championship)
Mark Martin has the second most wins in the Nascar Nationwide Series, with 49. Kyle Busch is first.
Currently, there is no driver using the #17 car in the Nascar Nationwide Series. It is used full-time by Matt Kenseth in the Sprint Cup Series.
Juan Pablo Montoya
Mark Martin with 8 wins.
In 2012, while racing full-time in the Nascar Cup Series, Regan Smith earned $4,153,890. He is now a full-time Nascar Nationwide Series driver.
Jimmie Johnson won a record five consecutive Nascar Cup Series championships (2006-2010).
Turner Motorsports is the Nascar Nationwide Series team that has Brandt as one of their sponsors. Justin Allgaier is the driver of the #31 Brandt Chevrolet Impala for Turner Motorsports.
NASCAR driver Elliott Sadler is now a full-time Nationwide Series driver. His last Cup Series race was in 2012.