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In accordance with RV trailer regulations, the minimum load capacity for the Original Equipment tires MUST equal or be greater (via inflation) than the vehicle certified GAWR (s). Therefore, all replacement tires MUST have a load capacity equal to or greater than what the OE tires provided.
Your Keystone owner’s manual will tell owners to look at the vehicle certification label for the required tire load capacity. It further informs the owner to look at the maximum load capacity of the OE tires to verify their maximum load capacity. That owner’s manual information is mandated by NHTSA to be included in the manual.
Many RV trailer owners read broad RV information sheets. Motorized RV tires must support the RV’s certified GVWR. Trailer manufacturers get to set a recommended tongue weight for all trailers they build. That tongue weight is deducted from the trailer’s GVWR to establish minimum GAWR certifications which they also set.
Without an option offered by the vehicle manufacturer, the OE tire designated size must be maintained. A ST235/80R16 is a designated size. That tire's designated tire size does not change with the addition of a higher load capacity letter. That extra load capacity is just providing load capacity reserves.
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