Specifications include, but are not limited to: Provide 24-hour towing, recovery, and road-side emergency services for County Heavy duty vehicles and equipment in separate categories as defined below. Heavy Towing - All heavy-duty trucks, vehicles, and County owned or leased Heavy Duty trailers, above 20,000 lb. GVWR and all heavy on-road and off-road equipment. Land- Doll/ Low Boy or equivalent Heavy Equipment trailer transport: All Heavy Duty on-road and off-road type equipment, combination vehicles, or machinery attached or coupled together, transported or towed in on a Land-doll or Low- Boy type heavy equipment Tractor-trailer. There shall be only one charge per tow or transport to the primary or “parent equipment” for transporting or towing combination or attached vehicle(s) and equipment.