I had a 98 2500 with the 8800 lb rear option. With my 2000 lb slidin camper it would be on the overload springs. With my 5th wheel it would be on them. Even a load of firewood and it would be on the springs.
Now I have a 2002 3500, which I thought had the same springs as my 2500. I had a load of "so wet it woulnt burn" firewood in there last weekend, never hit the overload springs.
Once I get my hitch installed I will see how well it does with the 5er in it. I hope it sets down some, the 3500 is a couple inches higher then the 2500 was in the rear, don't want to have to screw with raising the camper.