Trailer Spring

Trailer springs—typically in the form of leaf springs—are engineered assemblies of curved steel plates (leaves) designed to flex under load, absorbing shocks and maintaining stability when hauling cargo over uneven terrain. A standard leaf spring pack may contain anywhere from one to seven leaves, each tempered to balance strength and flexibility. When the trailer traverses bumps or dips, the springs flatten and flex, dissipating energy and reducing stress on the frame and axle, thus preserving structural integrity and ensuring cargo remains secure. The spring’s arc shape and number of leaves directly correlate to load capacity: heavier trailers require more leaves or thicker steel, while lighter trailers can use simpler, single-leaf designs. Eye-to-eye springs are common on lighter utility trailers, while slipper-type configurations are preferred in heavier applications for their self-locating pads and streamlined footprint.