My son has a 2002 F-350 dually crew cab long bed diesel. Should be pretty resistant to sway, right? He hooked up a pole trailer and loaded it with scrap poles being careful to make it tongue heavy. Got out on the interstate and up to speed. Suddenly he swayed across 3 lanes of traffic. After getting back under control he suddenly swayed back across the 3 lanes of traffic. All he could find wrong was one tire a little low, which of course didn't help. It was so scary he gave the poles away to someone willing to pay the rent on the trailer. He hauls construction equipment around on trailers and this should have been no problem.
Now he uses WD and anti-sway when he pulls his 5,000 lb. camping trailer with the same truck. Safety is a great big gray line--where on the line do you want to be? Maybe you'l be lucky and never need the extra safety equipment on your hitch. OP certainly doesn't need it for rear squat.
