While many weight distribution hitches are made to be compatible with a sway control attachment, the CURT TruTrack is an advanced WD system that integrates the sway control function into the design of the hitch. It combines precise weight distributing with integrated sway control to deliver the smoothest, safest ride possible. This, coupled with on of the easiest setups in the industry, truly makes the TruTrack unparalleled in its class. Instead of using spring bar chains, the TruTrack connects to the trailer frame using these heavy-duty, adjustable support brackets that hold the spring bars in place laterally and vertically. While regular spring bars angle from side to side, the adjustable support brackets allow the integrated sway control arms to resist this movement and keep the trailer better aligned. These brackets are compatible with trailer frames up to 8". Two replacement brackets are included in this package.