Mickey,
You state that you bought the trailer in 2004, which means the tires were made in 2004, but more likely the year before in 2003.
Most experts in the tire industry will tell you that a tire's life expectancy is 5 years, 6 years at most. Regardless of their tread depth, whether they have no visible sidewall cracks, or how few miles they have gone, they need to be replaced. The reason is due to the nature of the rubber compounds that deteriorate with age, to the point where the rubber becomes hard, doesn't grip, and starts to crumble. They really become a ticking time bomb after 5 years of age.
It doesn't matter whose tires you buy, they're all going to be problems if you are trailering them at that age.
Check the sidewalls for the DOT date codes of their manufacture. Close to the rim, every tire will have DOT in raised letters, followed by the date code inside a depressed oval shape. The 4 numbers give the year and week of manufacture. For example: 0348 means they were made in the 48th week of 2003.
Gene
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2004 Cougar 285
2003 GMC 2500HD CCSB stock,
except for Bully Dog Power Pup Level 2
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