The triangular wrench I used on the trailer wheels snapped. I had an old one that didn't fit in the hole between the spokes of the wheel because the cylinder heads were too thick. I took a chance because the photos showed that the heads aren't too fat. Luckily, lug nuts fit into the limited space available. I did a few quick twists on the trailer eyes and the truck eyes to make sure it didn't break. So far, so good. I now have a wrench that I keep in my trailer when I need to change a roadside tire.