The Collaborative International Dictionary of English v.0.48:

Cranage \Cran"age\ (kr[=a]n"[asl]j), n. [See Crane.]
   1. The liberty of using a crane, as for loading and unloading
      vessels.
      [1913 Webster]

   2. The money or price paid for the use of a crane.
      [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

CRANAGE. A toll paid for drawing merchandise out of vessels to the wharf, so
called, because the instrument used for the purpose is called a crane. 8 Co.
46.