Trunz's best finish at the FIS Nordic World Ski Championships was sixth in the team large hill at Val di Fiemme in 1991 and 13th in the individual normal hill at Thunder Bay, Ontario in 1995. His best finish at the Ski-flying World Championships was sixth at Harrachov in 1992 which was tied for his best individual career. He also finished sixth in a normal hill event at Falun that same year.