Vehicle sales are slow throughout the US right now, and a slumping housing market coupled with high gas prices means that trucks and SUVs are being hit extremely hard in particular. Large truck and SUV sales are down 9% through July year over year, and GM has halted overtime at six locations to help keep its large vehicle inventory under control. Workers from Flint; Oshawa, Ontario; Ft. Wayne, IN; Janesville, WI; Arlington, TX; and Silao, Mexico will need to punch out after completing eight hours work. GM wants to be sure inventories of its all-important large trucks don't get too high, which could necessitate higher incentives if available stock gets out of hand. GM looks very serious about keeping cash rebates in check, even with the possibility of a strike looming next month.