I agree with the mod. To me the greatest violation in towing is the ball height. A couple of inches can be the difference in the trailer being in charge and wagging the dog or you being in charge. I see so many that have borrowed their trailer from someone and not given any thought to pulling it.
I guess with all my trips across the USA I've seen far more than most. I will say 20% of those hauling trailers are 1. overloaded to a fault or 2. don't have the proper WDH in play or not there at all. With my long trailer that weighs a lot I can say that I rarely even know it is there once I reach highway speeds.
Three items make my day , ball height, WDH, and Mor/Ryde suspension on the TT.