(concurring specially).
I concur in the result and all of the majority opinion except Division VIL I do not believe the rights and obligations of tortfeasors between themselves should be made to depend upon their common liability to the injured person. See dissenting opinions in Iowa Power and Light Co. v. Abild Construction Co., 259 Iowa 314, 144 N.W.2d 303 (1966) and Shonka v. Campbell, 260 Iowa 1178, 152 N.W.2d 242 (1967).