The combination of Two Whetman Equipment Pythons and Two Whetman Equipment Ring Pull Prussiks can make a very simple to set up Pig Rig pully system or external mechanical advantage (MA) system.
Fast & simple to set up.
Rings replace pulleys & karabiners so does not exhaust limited supply of karabiners
Setting Up The Pig Rig
The first python is the anchor & wraps itself around a tree like a true constrictor; ideally a full strength tie off which presents the ring forward as a pully & leaves the other end available as the anchor to set up a Ring Pull Prussik to capture the progress of the haul.
The second Python threads through the rope grab Ring Pull Prussik and returns to thread through the anchor ring and then back to thread through its own ring near the rope grab to create the MA haul line.