During the pre-trip of a combination vehicle, which item requires inspection at the trailer's rear?

TRAILER REAR INSPECTION covers: DOORS: Sealed, latched, and in a configuration that allows them to open safely when needed — doors left unlatched can swing open at speed; UNDERRIDE GUARD (ICC bumper): Must be structurally sound — protects other vehicles from going under the trailer in a rear collision; LIGHTS: All rear lights required — brake lights, turn signals, clearance lights, marker lights, license plate light; REFLECTIVE TAPE: Required conspicuity tape on trailers — check it's present and undamaged; DAMAGE: Any visible structural damage, cracks, or missing components get documented on the DVIR.