You may want to think about this idea, Forklift caged platforms barely squeek by OSHA to start with and to attach to the rear of the truck which swings back and forth when you steer and have people in the cage while it is motion sounds like a recipe for disaster. Im not an expert in all the OSHA regulations but I would bet this rig won't fly with them. I would rather my helpers wear out their shoes and be tired then be responsible for their deaths--no malice toward you intended. Regards--roadrat