I am glad that your had fun putting together the spreadsheet.
What happens to some people is they try to tighten the WD bars to much, and end up with them overtightened. This will cause them to act like a spring, and actually take away from the stability. Just saying that if you have problems, try loosening the WD bars a small amount and see if everything improves.
Yes I have seen some towing safely without WD bars. However it was a 35' long travel trailer towed by a F-650 that had a large generator on the front end of it's flatbed. It was a movie studio truck towing a change room trailer.
Fred.
