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When increasing load capacity with the same designated tire size (ST205/75R14) from LRC - LRD there isn’t a warranty problem, they both use the same load inflation chart and provide the same load capacity at 50 PSI. However, there are a couple of safety checks you should confirm. One is the load capacity and PSI limits of the current wheels. The PSI is the primary concern because you’ll have to use inflation pressures above the 50 PSI limit of the LRC tires if you want to gain some desirable load capacity reserves from the LRD tires. . Sometimes the wheel/tire assembly provider will put the assembly together using the trailer manufacturer’s recommendations. That means a minimum PSI (50) valve stem may have been used and will have to be upgraded. Steel bolt-in valve stems are recommended for trailer wheels and they are very desirable if you want to add a Tire Pressure Monitoring system.
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