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The main reason manufacturers, dealers & retailers will not normally recommend axle upgrades is they invite overloading the vehicle's GVWR.
Axles do not have to be upgraded to support tires with load capacity reserves. Those load capacity reserves cannot cause vehicle overloading or axle overloading. Only weight beyond the designed limits can do that.
Those "Rs" (GAWR/GVWR) can only be legally changed by the vehicle manufacturer of a vehicle certified modifier.
I may be bias about trailer axles because in all my years of hauling trailers around the country I've never had one fail. Those that I've seen replaced suffered some sort of road hazard. We had our Everest with certified 6000# GAWRs for a little more than 14 years and a couple hundred thousand miles and sold it with the OE axles still in place.
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