Upgrade or replace your trailer's suspension system with this heavy-duty 12" trailer equalizer kit, designed for 2" wide slipper springs and 5,200 - 8,000 lb tandem axle trailers. Built from durable hot-rolled stee, this kit provides strength and reliability helping your trailer handle heavy loads while maintaining smooth, stable rides. The equalizer bar (E4151) works in tandem with the 7/8" x 4.62" equalizer bolt (FPB78-434) and nut to secure your suspension and allow controlled movement between axles. This ensures even weight distribution, reducing wear on your springs and improving overall trailer handling. Whether you're hauling equipment, cargo, or recreational vehicles, this trailer equalizer kit is a reliable solution for utility trailers, flatbeds, dump trailers, and cargo trailers. Multiple kit options are available to suit your needs.