I agree there are many out there that have experienced the same type of problem as you have had. If a combo can’t be stable with only minimal WD and maintain a reasonable speed something is fundamentally wrong. Ideally a hitch shouldn’t be used to solve the problem though that’s the route many take.

There’s really no easy answer to that question. He’s pretty much proven that changing hitches did not solve the problem but did show improvement. A epas flash has yet to proven as a resolution but it may be. Some characteristic of the combination seems to have reduced the critical speed below normal operating speeds. It could be just the right combination of TV weight, wheelbase, CG, suspension stiffness, steering ratio and tires for his trailer. The trailer has its own characteristics such as weight, CG, suspension, effective tongue length, inertia, and tires too. Once you attach these two together it becomes a complex system. A incorrectly setup hitch can indeed be the problem and it is quite common but it’s not always the source. There’s many towing with the same truck configuration that don’t have any problems at all.

If the weight distribution hitch is not used to stabilize the towing and distribute the weight why would we even bother. I have been towing for many years and with many different rigs and will guarantee you that if it is not adjusted properly it will effect stability. The only way it won’t is if your truck is barely loaded but that is not the way truck manufacturers advertise them.

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You’re a good example. You had a combo that was just fine with a basic WD and was stable so you know what it’s like. Obviously the new truck is the problem but what about it causing it may be hard to determine. On the the Blue Ox hitch the more WD you use the more force it applies to keep things straight. All that does is cover up the root cause, the real problem still has not gone away. There was another guy on here that had the same problem as you, I believe his name was Ed. To my knowledge he is still struggling to resolve his problems even after changing hitches. You can make the combo tow straight by adding a Propride hitch too but ultimately the problem will still exist. The hitch sway control should just be an extra measure safety and not be relied upon as the only means of stability.