With mules Grandma and Judy, a shotgun, two pistols, topographic maps, a journal, a camera, jeans, sneakers, a proclamation from then-Arizona Gov. Bruce Babbitt and, eventually, a stray dog they picked up along the way, brothers Troy and Gil Gillenwater walked 810 miles across Arizona from the Mexican border in the state’s southeast corner to the Utah line near Kanab, between Feb. 28 and May 3, 1982.