CURT Replacement TruTrack Weight Distribution Hitch Spring Bar, 15K Model 17537CURT Replacement TruTrack Weight Distribution Hitch Spring Bar, 15K Model 17537 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. Like all WD hitches, the TruTrack uses a pair