The way the line is set up is to lessen the load put directly onto the recovery vehicle and its gear. The majority of the load is in a straight line between the CAT and the RB. Some of my team used a similar method to assist a stuck DROPS wagon while on deployment last year. By using a large piece of scrap metal as an anchor along with several snatch blocks on the line, it enabled a straight line pull on the winch lines whilst not overloading the 110's winch too much! They chained and chocked two 110's onto the back of the one with the winch but could have got away with one to help anchor it. By the time i got there the DROPS wagon was nearly out by a combination of using its rack to push it forwards, driving itself and winching. The reccy mechs weren't chuffed when they arrived a short while later to discover it had been recovered by us!!