I've had bad experience with Cooper. Granted these were not truck tires. We put Coopers on the wifes car based on 50,000 mile rating, and American made. Or so we thought. The tires only lasted about 38K miles. Even with religious rotation every 6K miles these passenger tires still cupped and had horrible road noise. After we went back to the dealer and swapped to a different brand, we found out that not all cooper tires are made in the USA. As that tire dealer informed us, and a separate tire dealer also confirmed, there is some sketchy marketing going on with most manufacturers.

FYI there is only one way to be sure, and that is the DOT code on the side of the tire lists the plant of origin and company.
The code starts with DOT and is then followed by eight letters and numbers, arranged in an DOT XXXX XXXX pattern. The first two letters after DOT represent the code for the plant origin. It may then be cross referenced with the website below or NHTSA website.
Tire Origin Codes NHTSA