Thanks, Apple, but that's not exactly what I was referring too. Tongue weight I'm very familiar with - I used to work in a boatyard. I am looking for the total weight on front of the axles and behind the axles which indirectly accefts the tongue weight.
You could have 2000 lbs under the front window and have way too much tongue, while distributing the 2000 across 15' of trailer frame (before the axles) reduces the overall weight on the tongue. Then there's center of gravity, which is a whole other ball of wax, but we won't pursue that here.
Thanks for the reply, though!