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It is the absences of knowledge that allows tire threads to linger on.
For original equipment tires the correct inflation pressures are found on the tire and load placard, federal certification label and in the vehicle owner’s manual. Inflation pressures above what has been recommended are optional, providing there are any to use. The maximum inflation pressure to gain the maximum load capacity for your tires is molded on the tire sidewall. Using pressures above the maximum number will not provide a load capacity above maximum for the tire.
Vehicle GAWRs are set by the vehicle manufacturer. They, along with the GVWR provide the maximum load for that vehicle. The rule for axle loads will differ for RV trailers. Somewhere in the building process, the vehicle manufacturer MUST include some load capacity reserves. For most tow vehicles that load capacity reserve will be provided with axles that exceed the manufacturers GAWR values. Exceeding the manufacturers GAWR values and loading to the axle manufacturer’s axle certifications will almost always put the vehicle in an overloaded condition.
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