We suggest that you weigh the coach in loaded configuration and purchase tires to match the loaded weight. You can upgrade, for example to a load range H, but you will need to run at a higher inflation level to get the increase load capacity (remember that the air in the tire supports the weight and reduces sidewall flexing and destructive heat generation; the tread and sidewalls do not carry the load). That said, a couple of observations: across the spectrum of radial truck tires, we have seen the best reliability from Michelin tires. Some other brands have also performed well, although many have not. The most common problem we have seen with this tire type is uneven tread wear on the steer axle. No brand, including Michelin, has been immune to this.
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Hopefully this helps.
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