Trailer Shake, Uneven Tire Wear

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I have a single axle 6x10 utility trailer with a couple problems. First thing is when im pulling it down the highway, empty or loaded, it seams to shake my vehicle. It does this for about 5 seconds, then stops for 5, then does it again, the whole time at highway speeds. I can really feel it in my steering wheel. My vehicle does not shake when im not pulling this trailer so it has to be the trailer. It has not always done this which leads into my 2nd Problem.
The inside of these newer tires are wearing unevenly, almost like chopped if you run a hand over them. A trailer mechanic told me the only thing that causes uneven tire wear would be a bent axle, bent spindles, or bad bearings. Bearings are brand new. I put a straight edge across the outside of the wheel and measured from this straight edge to the frame behind and in front of the tire. The measurements are 1/16th of an inch difference, maybe an 1/8 of an inch, idk what this tells me? Measured from the axle to the back of the trailer and those measurements were the same.Any help would be great.
 
Sounds like it may be as simple as out of balance tires. A lot of people do not bother to balance trailer tires claiming it makes no difference... tow an empty car trailer with out of balance tires one time and feel it shake your tow rig and you will disagree.

Out of balance tires will also cause cupped wear.

Find a new "trailer mechanic" to talk to as well.

Mark...
 
Just took the wheels off to bring in to have balanced. While they are off i spun the hub by hand and as i watch the inner part of the hub as it spins it doesnt seam to be a true circle i guess you would say, like if you spun an oval shaped object. What could this mean if you know what i'm describing?
 
Not sure exactly what you are saying, but your hubs should spin true with no wobble or looseness.
when you put the wheels back on, before you set it onm the ground, see if there is any 'wiggle' or looseness in the wheel that will allow you to shift it in any way other than just spinning. if so, then you may have loose wheel bearings. this calls for tightening/adjustment or replacement depending on the severity of the wear.


Mark...
 

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