40 to 60 lbs of propane on the nose, another battery 60 more. Tools for the toys in the front storage, since its a front kitchen you will be adding another 100 or so for that stuff. You'll get close. But I would be careful about adding other stuff in the garage, especially all the way in the back. That should get the little sway you mentioned. Once you are up to your full load you can fine tune your WDH and get it a little more comfortable.
The torsion axles I dont think will allow anything to soften, but you could after loading everything weigh the rig and see if you can soften or even change the tires to make it a little easier.
Sounds like you are about to become a laid back relaxed type of traveller ie; 50 mph limit. :C
At least in Indiana.