2006 GMC SIERRA, WAS TOWING A 2005 JEEP WRANGLER USING A TOW BAR. THE TRANSFER CASE OF THE JEEP ENGAGED CAUSING THE WHEELS OF THE JEEP TO LOCK UP. THE VEHICLE IN TOW SPUN AROUND, TRAVELED OFF THE LEFT SIDE OF THE ROADWAY. THE JEEP STRUCK THE CONCRETE WALL AND ROLLED OVER AND BROKE FREE OF UNIT 1.*BF (OHIO TRAFFIC CRASH REPORT # 10-0435-90)*JB UPDATED 08/06/10 *BF