Mobile Outfitters 279687 Leaf Spring Equalizer; Equaflex; For 5-1/2 Inch Width Spring; Rubberized Suspension; Tandem Axle Trailers; 4000 To 6000 Pound Axle Load Capacity Dramatically Reduces Fore To Aft Trailer Movement, Otherwise Known As Chucking Helps Eliminate Trailer And Cargo Damage Caused By Road Shock And Vibration Delivers A Ride As Smooth As Torsion Axles At A Fraction Of The Cost Comes Installed With Our Never Fail Bushings