Figure $17\mathrm{.}12$ Safe lifting capacities for four crawler cranes. Chart courtesy of Manitowoc Cranes.

Using Fig. $17\mathrm{.}12$ select the minimum$-$size crane required to unload pipe weighing $\backslash (166,000\backslash$mathrm$\{$lb$\}\backslash$mathrm$\{$per$\}\backslash )$ joint and lower it into a trench when the distance from the centerline of the crane to the trench is $50$ ft $.(300-$ton crane$)$