Has anyone experienced a vibration only while pulling a heavy load? The vibration starts at take off and goes away at about 30 mph.

 

I have a bad vibration pulling my small cargo trailer with a small load or when I pull my boat. It starts at 60 on up to ? It is pretty bad to, I have to stay below 60 to keep it smooth. I don't even want to take it to the dealer because he will think Im nuts. And I m sure they will say its the trailer.

 

I have had this same issue while pulling my boat and asked the same question here about a year ago. Never got a response. Dealer said they could not duplicate and there are no DTC's and I dont feel like hooking up my boat to take my truck to the dealer to prove it to them. I did have one of the Mech at ford tell me it was probably due to change in the drive line angle caused by the tounge weight on the boat. Not sure I believe that.