it is a 2500 I have not weighed it, but it is just as it was when built. I do not tow or have not added any weight.
No offense, but you've added weight. Here's a brief list of item you likely have added:
Clothes
Kitchen ware
Water (potable, grey, and/or black)
Driver and passenger(s)
Food
Tools
books, computers, other entertainment devices
Some RVs on Sprinter chassis are built out from the factory leaving as little as 700 pounds for the above items. Driver and passenger alone are likely at least 300 pounds. 15 gallons of water is another 100.
It is surprisingly easy to overload an RV.