I've heard a rumour that the CFS re-badged a whole lot of its trucks because they too were overweight. (That is, they just re-badged what the maximum weight is).
I also know of at least one truck that now has less water because they traded weight in water for equipment... Are the truck max weights a safety thing, or a legal thing IMHO, the CFS should be allowed to go over weight if their operational requirements need it, rather than compromise safety by loosing water...