I have a set of 4 factor ST205 175 P15 Road Rider ST tires on my Wildwood Trailer. They have almost 20,000 miles on them. I would say that about 60 per cent of the tread remains. I have had no trouble with these factory provided tires. I run them at 50 psi, as recommended. I store the trailer inside so no sun damage to the tires. I run them at 65 mph on cool, nice days. On hot 95F to 105 F I try to keep speed below 55 mph. My trailer weighs about 6000 lbs loaded. However with Equal-i-zer hitch the weight on the 2 trailer axles is 4000 lbs and 4000 lbs on rear axle of Tundra and 4000lbs on front axle of Tundra. I attribute the low wear on trailer tires to Equalizer hitch. Absolutely no sway with this hitch and trailer weight evenly distributed. Without an Equalizer hitch my previous trailer sways back and forth and the tire wear was unbelievably poor. I am sold on the Equilizer Hitch. I think I can get at least another 10K on these RoadRunner factory tires. The indoor storage may also be helping me out a bunch. Not sure.
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