I cannot recall which towing thread taught me this lesson, but I wanted to thank the experts at TBN for saving me time and perhaps more.
I was towing wrong today. Had a SxS on my trailer and was going down the road. Got up to about 30 mph and it starts to wiggle. Even before TBN, I knew this was bad. Thanks to TBN, I knew exactly what was wrong and how to fix it. I was able to go about 25 until I got to a boat ramp. Pulled in there, loosened the straps and moved the load forward about 12-18 inches. (Retightened) Presto, no more wiggle, even at highway speed.
A hearty and sincere thanks to whomever (probably many of you) pointed out the symptoms of too little tongue weight.