Abstract: A device for mounting non-dimensioning equipment (5) on the structural frame (1) of a vehicle, that includes a plurality of fixings (6) for at least one piece of equipment (5), wherein it includes a plurality of fixing holders (4) bearing at least one fixing (6); a rigid intermediate frame (2) including a set of rigid assembling sites for at least one fixing holder (4); a plurality of rigid attachment clamps (3) for securing the intermediate frame (2) onto the structural frame (1), each attachment clamp (3) being rigidly anchored on the structural frame (1) and receiving at least one intermediate frame (2) portion and maintaining the same rigidly in order to prevent any undesired movement of the intermediate frame (2) portion relative to the structural frame (1). A vehicle equipped with such a mounting device and a method for mounting the mounting device are also described.