 Own the road. Ride on the Cooper Discoverer AT3 family of all-season tires from GCR Tires and Service. Redefine the limits of Alaska's ever-changing roads. AT3 means all season, on and off the road. Designed for aggressive performance on rocks, loose gravel, snow, ice, and mud, yet exceptionally quiet and responsive on the road. Own the road. Ride on the Cooper Discoverer AT3 family of tires. Buy yours at GCR Tires and Service. The tire guys. Taming the Alaskan road, Van Hornet Cushman.