Australian students at the ASRW (Advanced Skills Rescue Workshop) in 2013 at Mount Arapiles, Victoria came up with the "Arapiles T Bar" for anchoring a quad trackline highline tensioning system using three Arizona Vortex kits and a Skyhook capstan winch. Here, students on four AZTEKs used to pretension the T Bar against opposition anchors.
Len Batley, Australian Senior RTR Instructor, and Reed Thorne were instructors.
NOTE: Most of these AZ Vortex techniques are covered in the Instructor-level, 7 day long Artificial High Directional Workshop (AHDW) which RTR offers at different times of the year and in different US locations and foreign countries. See the latest Open Enrollment Schedule for the AHDW program which suits you.