Run Hard.  Jerr-DanĀ® vehicles are durable, reliable and perform beyond the expected in any conditions. Jerr-Dan sets new standards for performance, quality, technology and service. Jerr-Dan tow trucks, whether it be wreckers or carriers, have a proven track record in vehicle transportation. Maryland Carrier and Wrecker is the premier Maryland Jerr-Dan towing dealer, headquartered in Baltimore.