With Expertise Built In , the OTR Premium Heavy Duty Low Arch Trailer Leaf Spring is a direct replacement for OEM leaf springs and meets or exceeds OEM quality. This heavy duty trailer leaf spring minimizes vibration and provides maximum ride comfort. This OTR leaf spring replacement creates a smoother ride with optimized shock absorption. You receive ultimate support with any weight added to the vehicle, with excellent buckling and snapping prevention. This heavy duty trailer leaf spring delivers the durability and reliability you expect for the suspension's leaf springs of your semi truck. FleetPride is your First Click in Heavy Duty .