A conveyor unit which can be displaced for conveying vehicle bodies and which includes a bogie assembly and a coupling device which is connected to the bogie assembly and which is configured such that it interacts with the base areas of the vehicle body which are upwardly orientated to the roof. Also a conveyor system having at least one conveyor unit of such type and a plant for machining vehicle bodies. Vehicle bodies are conveyed by a conveyor system between and/or in machining stations, said plant also including such a conveyor system.