Abstract: A tow stabilizer device intended to distribute part of the load at the end of a tow frame on a level with the swivel joint of the coupling to the front and rear wheels of the towing vehicle and to the wheels of the tow frame while eliminating the swaying and rolling effects. The stabilizer includes a leaf spring or spring leaf at one end thereof articulated on a jaw and kept articulated in a vertical line with the support axis of the coupling's swivel joint. The jaw is braked in its lateral displacements by means of friction disks. The other end of the spring is connected by a screw jack to a crosspiece which is attached to the arms of the tow frame by flexible connections. Each of the flexible connections rest on a hinged bracket which is positioned on arms permitting the swerving of the assembly of the crosspiece and the spring leaf.