This one is temporarily bolted to the floor with 1/4" plates sandwiching the floor. i have a set of ruffstuff 3/16" unirail stiffeners which are going on and i will tue the 1/4" plates in to the rails with tube.
On my comanche tied the cage into my rock rails. These rails were welded to oversized plates at the frame and bolted to the pinch rails toward the outside. I never took any high speed rolls in that truck, but it help up well to flops, etc.