blw2, I’m not sure we should rule out the benefits of C-rated “Commercial” tires even if his experience/experiment doesn’t work out well. There are other brands also, which may be more expensive, but still lower than 17.5s.
I hope it works out great for him, but would also like to see other brands tried for additional comparison. Providing about 20% higher rated load capacity than the vehicles’ axles is a nice safety factor; at least from tire standpoint.
Obviously if tires are damaged from road debri or hitting curbs, etc. it won’t make much difference. That’s why more data points are needed.
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