Reese 66558 Steadi-Flex Lw Wd 400-600# This weight distributing system is designed with tapered spring bars for a softer ride Friction material, used for say control, provides a quiet ride Wide spring bars, with a simple pin and clip assembly, reduce wear in the head and on the friction pads No drill installation Will fit 6" frames w/bottom mount couplers, optional mounting for V-Nose trailers