 "Wyoming Sheep Ranch" held title for many years as the most difficult and dangerous aid climb on El Cap, but the inevitable widening of placements and appearance of fixed gear has subsequently reduced the grade to A4.As a specialist in climbs with poor protection, Slater was drawn to the Fisher Towers near Moab, Utah, famous for their soft, crumbly rock.Slater was the first and as of 1995 the only climber to summit all of the towers.