The tires are getting old and all should be replaced.
As for mixing and matching, it's not as critical on a trailer as it is on a car. On cars having different grip levels on different corners can cause a loss of control as either the steer axle or the drive axle loses grip. On a trailer, neither axle is a steer or drive so loss of control due to different grip levels of mix matched tires is less likely.
As for the brakes, it's possible it was a freak incident that won't repeat itself, but I'd adjust my mirrors so I could see the tire and give it several tests on gravel to make sure they are working equally.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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