I will tell you what my figures are and you can judge accordingly. I have a 2010 Dutchmen Lite 25 ft. We are a retired couple no kids.
Advertised dry weight 5000#, advertised tongue weight 400#
Loaded for the road and across the CAT scales, TT axel weights 5450#. Change to TV rear axel weight TT and WD hitch in place 750#. So total TT weight is about 6200#
My max cargo is 1410# so I have about 650# for family and toys.
The real problem is, the TT loading and WD hitch adjustments plus other variable, make each RV combo different.
A good guess is if your calculations show you are close to your vehicles capacity; you will exceed it.