Dexter 42" Spread Equalizer 14.75in L 2.5in 1 3/4 Spring Trailer Axle Pivot D44 (013-142-02)

14-3/4" Bolt Center to Center, 2-1/2" "lift"
 Long equalizer connects double-eye springs on tandem axle trailers and allows for enough movement between the axles to keep the ride smooth and the load undisturbed. Center bolt hole is 9/16" in diameter.

Found on many campers and trailers with the cool "Spread axle" design