GVW / GVWR Ratings on trucks? Help me understand this.

If you had clicked the links, I think you would have seen the specs on the trucks are identical, except for the GVWR. Thus the question... and confusion. I get that there can be a wide discrepancy in truck specs, but this particular spec (GVWR) seems to be meaningless.

I've driven several different single-axle cabs pulling double trailers well over 80k lks (no scales at the farmer fields!) over the last year, it's really common out here. Companies with fleets of 100-200 trucks doing nothing but running T880s with single screws pulling max weight from the fields out here...

I guess my question is if this is just a DMV registration quirk as alluded to above (save on registation/tax) or if there is legitimately something about one truck from another that would make it less capable of hauling a full load. I suspect the former...

 

Educate me. I've heard that, but it's a truck rated to pull 80k and it's running a dd13 engine. What makes it different?

You can buy different versions of the M2 that are lighter weight, but this is a class 8 version. What am I missing?