Who really knows how they design these things? It's beyond reasoning sometimes.
Our fresh water is at the front of the trailer just behind the A-frame. Our tongue wt. is nearly 15% with all 4 tanks empty. I hate to think what would happen to the tongue wt. if we filled the fresh water tank right up. But we are just 200 lbs away from the GVWR and filling the fresh tank right up would overload the TT. We're not into dry camping so won't have to worry about it. Not sure what kind of an engineer would design it this way.
Unfortunately, most of the time you don't find this out until you've bought the TT.
I've read a lot that some say to shift the cargo/load around to balance the weight distribution out. But I don't see this can be accomplished. Kitchen stuff needs to go into the kitchen. It's not practical to put all your canned goods up front in the bedroom. Seems to me most of the heavy stuff inside (cargo) is kitchen related - food, dishes, toaster, cutlery, etc. In the case of our TT with a rear kitchen, I don't want to take weight out of the kitchen otherwise the tongue wt. is going to be over 15%. I can't see moving anything of weight around other than maybe a few cases of water or pop but there's just no other place than the kitchen, at least in ours. Maybe this is just an urban myth.