List of NASCAR drivers who have won in each of top three series
Driver championships in two of the top divisions

Driver
Driver
1st Monster Energy Cup Championship
1st Monster Energy Cup Championship
1st Xfinity Championship
1st Xfinity Championship
1st Gander Outdoors Truck Championship
1st Gander Outdoors Truck Championship
1.
Bobby Labonte
2000 Champion
Winston Cup Series
1991 Champion
Busch Series
-
-
2.
Greg Biffle
-
-
2002 Champion
Busch Series
2000 Champion
Craftsman Truck Series
3.
Johnny Benson Jr.
-
-
1995 Champion
Busch Series
2008 Champion
Craftsman Truck Series
4.
Brad Keselowski
2012 Champion
Sprint Cup Series
2010 Champion
Nationwide Series
-
-
5.
Austin Dillon
-
-
2013 Champion
Nationwide Series
2011 Champion
Camping World Truck Series
6.
Kevin Harvick
2014 Champion
Sprint Cup Series
2001 Champion
Busch Series
-
-
7.
Kyle Busch
2015 Champion
Sprint Cup Series
2009 Champion
Nationwide Series
-
-
8.
Martin Truex Jr.
2017 Champion
Monster Energy Cup Series
2004 Champion
Busch Series
-
-

Question: How did Bobby Labonte do in NASCAR in 2000 and 1991?
Answer: Bobby Labonte won a championship in 2000, at the NASCAR Winston Cup Series (now the Monster Energy NASCAR Cup Series), and a championship in 1991 at the Busch Series (now the Xfinity Series).