9 axle lowbed would be common terminology for this type of equipment even though it’s part of the double drop trailer family. This is an open deck trailer that can haul all the same commodities as a regular double drop RGN (construction machinery, cranes, crated machinery, large diameter pipe, solar batteries, transformers, precast products, counterweight, commercial vehicles, etc) but this combo can scale more weight than a steerable 9 axle. This trailer has a removeable gooseneck that allows it to drive freight on from the front of the trailer in addition to standard freight being lifted onto the trailer. The only caveat with this trailer is that it’s not steerable in the rear, so limited access projects is not recommended. These trailers are popular in the western states and depending on the product dimensions this combination can scale up to 176,000lbs.