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If the truck towed fine with a different trailer, and the issue you describe only occurs past 50MPH, I would check the alignment of the trailer axles. It really sounds like the trailer is initiating the tug to the rear of the truck not the truck causing it.
If its a new trailer, it's possible "someone" prior to your delivery of the trailer has hit a curb to knock it out of alignment. Also check the wheel rims of the trailer are true and round....
I am assuming your WD hitch is set up correctly, and have adequate tongue weight, and tires aired up to a PSI for towing (on the truck) and weight capacity (on the trailer).
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2005 PSD Ford Excursion 4x4
Rear Ride Rite Air Bags
Helwig Swaybar
Rancho 9000's / Rancho Steering Stabilizer
Prodigy Brake Controller in Cubby Hole
ART Rotors
Hensley Hitch
GOS Performance Headlight Harness / Sylvania ExtraVision Bulbs
Pulling a 2008 Airstream 27FB International Signature Series 
Last edited by Bambi_Bandit : 05-08-2008 at 03:48 PM.
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