General Motors Corp. recently announced a new round of sales incentives for its redesigned lineup of full-size pickup trucks; GM needs to keep up with deals being offered by competitors in the pressured vehicle segment, the auto maker reports.GM is offering 0% financing deals on 36-month loans on certain versions of the 2007 Chevrolet Silverado and GMC Sierra. The company is also offering reduced-rate financing on 60-month loans for the trucks, which are among the company's most profitable products in its global lineup. Depending on the model, customers can choose between $1,250 and $1,500 cash back in lieu of the financing. The deals were kicked off on May 4 and run through July 9. The closely-watched days' supply of the Silverado and Sierra sits at 101 days and 129 days respectively, far more than key competitors in the large pickup-truck class, according to Autodata.