I found out the same thing here. My company actually manufacturers the scales so I have access to one at any time.
I had weighed my truck and toy hauler empty on the way home from buying it and had about 1,000# of cargo I could add. Who would have thought it would add up so quick.
Stopped in again on the way home from a race fully loaded and was at 13,740 GCWR and according to to Dodge shouldn't go over 13,000 with the 3.55 gears I have (it bumps up to 14,000 if I would have the 3.92).
I was also reading 7,140 on the GVWR and shouldn't be over 6,650.
I would have never guessed as the thing towed fantastic, kept the cruise at 60 MPH and it never went over 3000 RPM, and averaged 10 MPG.
Thing is, I don't have a whole lot I can throw out of the truck or toy hauler. Maybe one of the spares (I carry two), one of the two TV's, or a couple cases of pop/water. All tanks on trailer were empty, full tank of gas on truck. Maybe the wife will have to go