Hi, wanted to know if anyone had experimented with the power windows on a 2008 Silverdaro. I have a brand new 2500 extended cab and wanted to have the remote start/power lock also close the windows. I have had this on my GMC van for years and other that adding a after market alarm system does anyone know of a way to do this over the factory alarm system. Or does anyone know where I can get a electrical manual for this vehicle. Dealer tell me it not available!