The invention relates to a heavy-load transport vehicle (10) for transporting an elongated object, having a tractor (14), a multi-axle trailer (16) and a carrier (18) for the elongated object supported on the trailer and on the tractor (14), wherein the trailer (16) and the carrier (18) are rotatable in relation to each other about a vertical axis (52) of the transport vehicle (10). According to the invention the carrier is supported on the tractor (14) via a goose-neck (22), the trailer (16) has at least one rigid axle (42, 44) and at least one steering axle (40), and in a steering operation mode during the journey, the steering axle (40) of the trailer (16) is steerable in relation to the trailer (16) about the vertical axis (52) as a function of the rotational movements of the carrier (18).