Manitowoc Introduces National Crane NBT60L Boom Truck The Manitowoc Company has launched the NBT60L, the latest addition to its National Crane boom truck product line. This 60 ton product offering now features the longest boom length in its tonnage class with 151 ft. (46 m) of main boom and a maximum main boom height of 161 ft. (49 m). It can be equipped with an optional 36 ft....