thanks for all the explanations, seems like all the older stuff was overbuilt, I knew the construstion equipment was but have never had any dealings with cranes before this one. Luckily for me my 35 ton lowboy will haul 35 tons of weight because if not this crane would have broken it. I told them if it was over 55k pounds, it wasn't going on my lowboy, that I wasn't getting enough out of the deal to break my trailer.
Discuss this in the forum topic how are cranes rated?.