I couldn't find specs on the B-series mass excavator model, but it has to be around 100 tons. I would guess that the truck could probably pull it, but it might be tough to physically fit it on the trailer. A while back I saw a Komatsu Pc 650 being moved. They drove it over the trailer and then put blocks under the frame and lifted it up, it was an interesting setup to say the least. A 385 is bigger than than a 650, so it would take a pretty specialized trailer to move it assembled. The one pictured above takes up most of the trailer and doesn't even have a counter-weight attached.