Trailers

Depending on the trailer and coupling system, the examination may include the coupling assembly, locking mechanisms, kingpin or hitch components, applicable safety connections, mounting hardware, wear patterns, deformation, and maintenance or repair history. Physical findings may then be compared with photographs, inspection records, repair documentation, and available information about how the trailer was connected before the incident.

Load placement and weight distribution can affect axle loading, balance, braking and traction, handling, cargo movement, and rollover stability, depending on the trailer configuration and operating conditions. A suitably qualified expert may examine weight information, cargo placement and securement, axle or suspension configuration, center-of-gravity considerations, and other evidence to assess whether loading conditions were technically relevant to the event.

Inspection reports, repair orders, brake and tire service records, parts-replacement records, photographs, applicable driver inspection reports, and prior defect reports may help determine whether a condition had previously been identified, inspected, repaired, or documented. Those records may also be compared with the trailer's physical condition after the incident to evaluate its maintenance and condition history.