2 Separate Blowouts on RV Yesterday. Learned Important Lesson on Tires

Just a FYI. I used to remove the tires from my pickup, and install them on my open race car trailer, at about half tread life. I was having a problem with the tires failing on the trailer. After I started marking the rotation of the tires when removed from the truck, and installing them with the same rotation on the trailer, had no more problems.
PS: The tires had more load on the truck then on the trailer.