double cantilever (crane)

English to Spanish Tech/Engineering Mechanics / Mech Engineering cranes

Although my document is not terribly technical a few things appear here and there. I just want to make sure I found the correct translation for it. Is GRUA DE DOBLE VOLADIZO correct o is it EN VOLADIZO CON DOBLE BRAZO?

Document is on how to receive/analyse company feedback from clients.

Context:
Production performance data for plants assembling DOUBLE CANTILIVER and single girder portal cranes:
(Then a table with numbers on performance, percentages)

TIA
Any help appreciated