Maybe he was referring to a sway bar on your hitch. I towed a 27' weekend warrior toy hauler for five years with a 3/4 ton pickup with out one in windy conditions here in Wyoming and there were only a hand full of times that I thought maybe I should have invested in one. Although my neighbor tows a 24' trailer with a older Ford Explorer and he swears by his sway bar. I think the secret is truck weight verses trailer weight. If your trailer ways alot more then your truck then maybe you need one more.