What is a Puck Pull Bar?

What is this? I’ve seen tons of different suspension set up’s, but never one that requires puck pull bars?  But I really think I need some pucks to initiate some traction. But then I get to amplify it when the bar locks out and more pucks engage!   WHAT?

Bill Caswell is a self-taught racing driver, mechanic, and fabricator, and rose to internet fame taking a $500 Craigslist BMW to a World Rally Championship event in Mexico in March of 2010. His exploits have featured in places like ESPN Magazine, Grassroots Motorsports, NPR Radio, Wired.com and Jalopnik.com. A lifelong fan of rally and motorsport, Caswell famously believes nothing to be impossible.