I remember hearing at the time that a major argument against Crusader was it was too heavy at a time when the US needed to prepare more for rapid deployment. But it looks like the PzH2000 weighs a lot more than Crusader.
There is a lighter version of it: https://en.wikipedia.org/wiki/Artillery_Gun_Module
Also, the argument that the PzH was heavier than the Crusader falls over when you realize that the Crusader had to have a second equally large, about equally heavy vehicle following it around at all times to carry its ammo.