CURT Replacement Light-Duty TruTrack Weight Distribution Hitch Spring Bar, 8K Model 17535CURT Replacement Light Duty TruTrack Weight Distribution Hitch Spring Bar, 8K Model 17535 While many weight distribution hitches are made to be compatible with a sway control attachment, the CURT light duty 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 deli ver the smoothest, safest ride possible. Like all WD hitches, the