Fishtail
We have a 2011 3585sa, towing with 05 f250 stock suspension. Hitch was too high when first installed, lowered it 4.5 inches, but even when high, never had any problems with fish tailing. As others have stated, find out what pin weight is. This problem is almost always from trailer lifting tv rear. I would definitely check that before I spent money on anything else.
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