2010 GMC 1500 EXTENDED CAB SLE PACKAGE NEWER A/T TIRES. At Timberline Auto it's always easy to find a great deal! For more info contact one of our friendly sales staff at (208) 523-4000 or to arrange a test drive come see us at 1580 E. LINCOLN RD. Idaho Falls, Idaho. To view all of our inventory please visit us at www.timberlineautosales.com.