To the OP, thanks for your post. I is an important message for everyone. At least for those not in the know and are experts in the field.
Interesting comment. How would anybody know if the weight distribution hitch works at all if the operator does not understand the relationships between the trailer and the tow vehicle? And, more importantly, how to recognize sway when (if) it occurs and how to counter it? Since you have an Airstream you might avail yourself of the issue(s) in the Airstream magazine publication that described how a weight distribution hitch works and what sway is and how it is countered. You might also visit the Airstream forums and since you have an Equalizer hitch learn about all the damage they can do and have often done to trailer tongues.