Also, if anyone can share an equation to figure out carrying capacity that would help too. Not much info is given on used models
Yes there is!
They usually place a complete spec sheet on the wall of the closet when it comes from the factory. It will be on almost all of the used ones because no RV'er ever takes it off so the next owner will have the info.
You will find your CCC there and everything else you will ever need to know about that coach. And if a salesman says he doesn't know, which most don't, push him aside and head for the closet to show him! The private sellers will know where that spec sheet cn be found.
BTW with "6" in your family?
I would DEFINITELY recommend the V-10 E450 in a 31 foot Class C!!!! :B