Has anyone else encountered this? I have a 2009 XLT Supercrew 4x4 and experience extreme truck vibration when pulling a trailor. Seems to do it worse between 60-70 mph. Anything slower or faster and it gets somewhat better. Also seems to do it worse with lighter loads such as single axel 12 ft trailor loaded with 1 ATV. I have pulled many different trailors to eliminate trailor problems. I have had wheels re-balanced thinking that might be the problem. Absolutley no vibration when NOT pulling a trailor. I am stumped. Anybody know what causes this, or how it can be corrected?

 

Have you checked the balance of the wheels on the trailers. You could be getting a vibration transferred into your frame from the trailer.

 

Probably unlikely since he's towed numerous trailors and having the same problem.

 

My vote would be a bent wheel and when you put a trailer on it, it is just enough to make it present.

 

Have a full alignment done.

 

My 2005 F150 King Ranch 4x4 Supercrew did this as well. This was one of the reasons I got rid of it as well. I hated the drivetrain in that truck. The 5.4 3V and transmission were junk and had NO power.

 

I know this is an old post, but I am having the same problem with my 2010 s/crew 4x4 towing around 4500#. The truck is in having the wheels balanced today, so will see if that helps. Was there ever any resolution to your problem?

 

If you had the TSB performed by the dealer for the driveline "clunk" on start-up (where they took out the driveshaft and replaced the grease in the slip yoke), they probably didn't index the driveshaft correctly. Happened to me and only noticed it when towing. After I argued with them and they called Ford Tech, they fixed it and now it is right. Do a search here on "vibration" and the post will pop up.