That's a hot question which is sure to garner debate. There are some here who seem to believe that going even five pounds over will lead to the axle breaking in half, and there are some here who believe that going over a few hundred (or thousand?) pounds is no big deal. And there are plenty in-between.
I phrased my comments to you carefully and conservatively, for I am proceeding carefully and conservatively with our own RV. Since I'm just starting out, I don't want to exceed
any ratings. The last thing I want when just starting is a ruined trip, so I'm going to keep it light and tight. Once I get a few more miles under my belt, I might feel comfortable exceeding ratings here and there.
Here's a good thread for this question:
Is being a little over GVWR no worse than doing 60 in a 55?