What causes a trailer to dogtail?

New 2017 trail dog tracks

 

Not sure,maybe mismatched tires.Try a different tandem adjustment hole.Have pulled trailers where the kingpin wasn't exactly in the center of the trailer!!

 

DogLEG

 

They don't align them at the factory when they assemble them. The production line is moving and they don't fine tune something like that. No time for it the line must move. They basically just eye ball it and get it close enough. It's "within spec" that way and considered dealer prep work to align one anyways. Of course dealers don't do it for free. Picked up my 2016 from the factory last year and it dog tracked until I paid a Great Dane shop to align it.

 

This is true. I bought a 2007 Tridem drop deck brand new , when I picked it up from dealer I didn't go more then 1/2 mile and noticed it was dog tracking about a foot to the curb.
Had it aligned at a shop and lodeking paid for it. Been perfect ever since!

 

It has to do with an unbalanced load. The trailer will track towards the heavier side.

 

You might get some argument about that.

 

I've sometimes taken and slid the tandems all the way back and kinda make sure the tandems slam a little to get them straight, then I slide them forward and it usually fixed the dog tracking....