Toyota is apparently on track to sell more of its Tundra pickup trucks than General Motors will sell half-ton GMC Sierra 1500s. Historically speaking, two-thirds of Sierra sales are the lighter-duty 1500 models and Toyota has sold more Tundras in the first half of the year than GMC has Sierra 1500s. Although the Sierra has always been a relatively small player in the full-size pickup game - at least compared to its Chevrolet cousin, the Silverado - it has consistently led Toyota in sales. Toyota has seen considerable success with the 2007 Tundra and for it to have taken over one of the domestic players is indeed big news. Toyota has sold 97,290 models of the all-new '07 Tundra since January 1, 2007 and GMC has sold 115,185 Sierras. Historically, however, two-thirds of Sierras are 1500s, the Tundra's real competition. By that measure, according to PickupTruck.com, Toyota has sold more Tundras than GMC has sold Sierra 1500s in the first half of the year.