You may want to check the Terrain's front end alignment, and make sure the distance from the front wheels to the rear ones are the same (if it has been in an accident).
Also, you have unlocked the steering wheel to ensure the front wheels can turn?
Of course, even things such as different tire pressures in the Terrain's tires could contribute to sway. So check all of that stuff.
Finally, and I am not saying you are guilty of this; excessive speed can result in sway in any trailer.
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The only thing that works on a RV is the owner...
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