Heavy ridged vehicles and trucks can best be described as vehicles that have a maximum gross vehicle mass, which can be specified by a manufacturer and support more than 35,000 kilograms in weight, refer this link to know more about weighing.
These vehicles include heavy buses, heavy trucks, mobile cranes, fire engine trucks, heavy mobile homes, heavy forklifts, heavy self-powered agricultural, as well as constructional machines, heavy tractors and all types of vehicles that have pivot steering. These vehicles usually have two ankle sets, a steering position and system, a single rigid chassis and a motive power. Some special vehicles are also legally seen as rigid vehicles.