I think the point of the whole argument regarding the trailer gross weight rating vs what it's advertised dry weight is....and all the yada, yada that surrounds the discussion is this: you need to know what the trailer really weighs, as you would use it, ready to go camp.
For instance, my trailer has a GVWR of over 6000 pounds, but in reality, it weighs just under 4000 pounds when I pull out of the driveway. So it's good to know real numbers, and there is no substitute to rolling it onto the scales to find out the truth.