From what I've read here, the best way to completely eliminate the possibility of sway is to use a WD hitch and dial up the springs enough to lift the TV rear tires
off the ground and the weld everything in place. This provides a long wheel base and nothing moves. <grin>
Seriously, I really enjoyed reading this thread. I'd recommend it to anyone interested in WD hitches. I have been a believer in them since pulling a 6500 lb plus trailer with a K5 Blazer many years ago. I had no issues with sway and did like the positive steering feel it provided.
The Blue Ox system seems impressive and I particularly enjoyed reading the analysis of how it provides sway control. I'll check back to see if any Blue Ox owners provide further updates, insights, etc.
Thanks again to all you contributors.