Picked up a new 5x10 utility trailer this weekend. Drove it about 100 miles to pick up an ATV. On the way, empty, it towed just fine, no issues. Once I loaded the ATV (about 700lbs) and started to drive home, I experienced some pretty significant vibrations at highway speeds, around 60-65mph. The vibration was variable and would get worse at times and then subside, but significant enough that I could see the front of the truck shake. The trailer was level and I adjusted the load a bit during the ride back to see if it was due to the weight distribution to no avail. Now I've towed other trailers with heavier loads with my truck and they were always smooth as glass, no issues. I'm not thinking it's the truck.
When I got home, I raised the trailer to check the wheels and tires and found that both tires had at least 1/8 inch of run out (not round). The rims where good. When I spun the wheels you could visibly see the vertical wobble. I thought it might be flat spots, but after 200 miles those should have resolved themselves. My question is, would a 1/8 to 1/4 inch run out (both tires) cause this type of vibration? The trailer dealer is checking with the manufacturer on next steps, but looking to see if anyone else has experience here. Thanks