Rock Racing How to choose a custom suspension, building a double triangulated 4 link, plus rock racing from Jellico, TN. Choosing the right shocks, coilovers or air, reservoir of mono tube all details will be discussed, plus Ian builds a mock up chassis and gives step-by-step instructions on how to calculate and build his favorite set up. And our cameras roll to Jellico, TN for the XRRA nationals in rock racing!