Weigh of rig help

[MrRobalo]

We just took our second trip in our Bullet 220RBI with dry weight 4664 And GVWR 6400 . Tow vehicle is 2012 Dodge Durango R/T with weight 5350 lbs.
I have a Equalizer 10,000 lb weight distribution hitch on it and adjusted so rig is level. We had it loaded like we would travel 2 coolers full ice n drinks, water tank full, dual deep cycle batteries . We took it to get weighed at our transfer station On our way to the campground. The Durango and trailer combined weighed 12,300 lbs and with just the trailer wheels on it the weight was 5320.lbs
If I understand the formula right I’m not overloaded, But just want to find out from those who know More than I do just to be on the safe side. I’ve only pulled it at highway speeds for 20 miles and the rest around town but seems to pull fine. I was in the marine boat manufacturing Industry most my life and have towed large boats all my life but will admit a travel trailer is totally different.
Any info will be appreciated,Thank You