I don't know if this will help you but, I borrowed a truck that the steering box was bad. That is the only time I had a 5th wheel trailer fishtail on me. You said that you have a 2018 truck but I would have front end checked out. Steering box, ball joints, end joints. See if your not having a problem up there...
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Charlie & Sofia
Sawyer (The Lawyer) Buster Brown Fur - babies
46 years married (Dam I been in prison that long)
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