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A flow chart according to FMVSS.
Tire manufacturers must provide a list of acceptable wheel/rim sizes for all tires they build (not specs).
Wheel/rim manufacturers are not required to put specs on the rims they build. They are required to put the part number/serial number and their address on the wheel. They are also required to provide specs when called for.
OEM providers of wheel/tire assemblies must insure that the assembly meets minimum FMVSS requirements.
The vehicle manufacturer may defer questions about OEM assemblies to the OEM provider. However, when the vehicle manufacturer assembles the wheel/tire assembly, they are responsible for insuring such assemblies meet FMVSS minimum standards and become the contact point for such assemblies.
IMO, the first answer about such assemblies should be provided by the vehicle manufacturer.
NOTE: Every NHTSA recall I have reviewed about improper rim specs for RV trailer applications have been against the vehicle manufacturer. I'm sure it's because they certified the vehicle and in doing so said everything met minimum safety standards, when in fact, the wheels did not.
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