Portable Side-Fold Radial Stackers The KPI-JCI Side-Fold Radial Stacker line is designed to meet your mobile stacking needs.  Available with manual or hydraulic folding options, the side-fold radial stacker comes in multiple sizes up to 125 feet long.  Ease of portability allows you to set up and tear down quickly, making this unit perfect for mobile producers, as well as stationary producers with multiple locations in need of supplemental production.