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This is an aerodynamic thing, not a weight thing. You're encountering the "air-wall" that is being created by that semi you're passing. It creates a current of air which pushes you away, up front, but causes a low-pressure (vacuum) rearward. Your trailure is being "sucked" toward the semi-trailer.
You may want to steer farther to the left, when passing. Anticipate the air-wall, and correct for it.
Otherwise, a bigger truck may be necessary.
Do you have a distribution hitch??
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