A prime mover and trailer was transporting 20 bog mats (in two separate stacks) and a pump skid from a camp pad to a well site. After travelling about 700m on an in-field private track, the trailer unexpectedly disconnected from the prime mover after driving over a cattle grid. The trailer came to rest on the track. The back stack of 10 bog mats moved forward and made contact with the pump skid. The front stack of 10 bog mats came free and cascaded out onto the road. The trailer and pump skid were damaged.
