Getting started....tow vehicle recommendations....PLEASE!

Newb question here.
I think I understand dry weight vs. GVWR in the TT spec.
Why is GVWR the only number to consider? One of the earlier posters mentioned an Arctic fox with a dry weight of 4815# and a GVWR of 7500#. Am I really likely to add 2700# of stuff to a 22' TT?

What if the same TT only had a 6800# GVWR, but was otherwise the same. Would that affect the TV that was needed?

I guess what I'm saying is shouldn't you consider actual loaded weight as opposed to the max it is rated to carry?