Spanish to English Tech/Engineering Transport / Transportation / Shipping Heavy haulage

This is the description of equipment used in self-unloading heavy equipment (>200 tonnes) from a trailer. It comes from the description of the proposed work to be carried out by a heavy haulage company. Basically they receive some power generation equipment from a ship and then transport it within the port area before unloading it in the "second line" of the port. The company then picks the equipment up again later for transport to the power station, where they say the same equipment can be used again in unloading if the customer requires.

Wahat exactly is this equipment and how do we say it in English (UK preferred).

Context:
"Para realizar estas maniobras de auto-descarga, se utilizarán vigas cruzadas de manipulación, borriquétas de apoyo y repartidores de carga al suelo, según sean las exigencias portuarias."