I know the WORST place to add mass (= weight, inertia) is far away from the center of the trailer.
So adding a generator rack at the end of the trailer is certainly a BAD idea (if concerned about trailer sway, stability, etc).
The A frame seems to be a good spot on the trailer, but I need to relocate battery (maybe buy sealed battery and put under floor; does not need to be accessed often). And do something with the 2x 20lb propane bottles (get rid of one), replace the other with stationary, cylindrical placed under floor, or a horizontal, smaller diameter.
Then make mount/platform for generators (2x 2000W)?
Ideally: make custom FRONT BUMPER mount for towing vehicle!!! The added weight on the front (steering) tires will actually HELP with sway, stability, etc.
Just need to find the time to take the front bumper off and find where the 'hard' points are (here: 2004 VW Touareg towing 7000 lb trailer).