I'm glad you finally got it. In fairness to Dennis and myself if I'd gotten here sooner there were two things that bothered me too. 1. "Now I have never weighed all 4 corners and doubt I ever will." and 2. "Where does one go to weigh an RV?". Made it pretty easy to assumed that you never have weighed even each axle but you are willing to take a salesman advice over the sticker. 83 sounds like it was accurate for when the rig came off the line without any dealer/owner added items. I doubt that after weighing you will be able to go lower than 83 BUT until then we are all just guessing.
I've weighed several times at closed weigh stations in OR and I've been able to put one side off the scale so I can calculate the corner weights.