General Motors North America President Alan Batey said today that the company will ramp up production of pickup trucks and SUVs in anticipation of fall market demand, a period that typically accounts for 60 percent of annual sales.

Batey told members of the media that GM has faced challenges trying to build enough Chevrolet Silverados and GMC Sierras, acknowledging that supply constraints have likely resulted in the loss of some sales.

GM inventory levels of Silverados stood at 83 days as of July 1, compared to a 105 day supply of F-series pickup trucks at Ford dealers.

Combined sales of the Silverado and Sierra were up 1 percent for the first six months of the year to 380,118 units, trailing increases of 11 percent to 395,244 units for the F-series and 9 percent to 231,405 units for Ram.