Motorhome storage can be a real trying experience. For a real accurate picture of your weights, get a 4 corner weight. That is one tire at a time then adjust your air pressure by going by the heaviest tire position on each axle.
Also I noted that you weighed with nearly full water tanks. There are few instances I can think of where driving with a full load of water is necessary. I carry about 20 gallons of fresh to flush and what not, then at or near the campground if necessary.
Also the placement of your fresh water tank can also throw your loading off when you prepare to load up for a long trip. Just carry the water necessary to get you where you are going, and use the saved capacity for the real important stuff, like chips and beer......