You probably have wheels rated at 3750 lbs and 110 psi. The rating will be cast into the inside of one of the spokes. If that is what you have, you can use any tire that fits that range. Don't worry about the weight rating, as you should have 7,000 lbs axles, so the 110 psi is the highest cold inflation pressure allowed. Do not worry about higher pressures as a result of driving, as that is already figured into the ratings of both the wheels and the tires. Be careful about tires that you may not be able to get adjusted if you are away from that tire shop, and no one else carries them.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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