Need help figuring out why my rig is overweight

RV manufacturers are notorious for listing dry weights without any options. Unless they weighed the coach you have no idea what it really weighs until you take it to a scale as you did. The coach more than likely weighs way more than listed as a dry weight. Figure water at 8.3 pounds per gallon, batteries, propane, etc. It all adds up. From the scale weights you are actually over your axle rating and maybe tire ratings as well.