Husky 31390 Center Line Head Assembly No more removing the sway control when backing up as Center Line system would solve the purpose No more waiting for the trailer to right itself as passing trucks, wind or road conditions cause sway as the Center Line system is self-centering Provides constant pressure to re-enter the trailer behind the tow vehicle and eliminates use of clamped friction materials Can be used while backing up Tapered torsions spring bars help transfer weight between axles of the two vehicles for safe towing