was towing a tandom axle trailer with about 3,000 ibs on it and was getting a vibration around 65 MPH. I've towed with my truck before and never felt this. Any chance its the trailer. 07 F-150 supercrew Lariat 5.4L.

 

Sure there's a chance it's the trailer but I'm guessing it's not. Can you be more descriptive as to what you felt, (heard smelled etc)...

John

 

It was a vibration in my seat kind of like like having an unbalanced rear tire. No smell, no noise and it was there when going down a hill off the accelerator or just cruising along on level interstate. It shows up around 62 mph and doesn't get worse with speed stays the same and comes and goes. Its very noticeable on newly paved interstate. It doesn't do it when i am not towing this particular trailer. Just curious because i've hard issues with f-150's and towing.

 

I haven't noticed that when towing, but I had the vibration and I had my tire checked and had one defective tire that Bridgestone replaced. I would suggest taking it to a good shop and have them look at the tires