RV MFGS recently started using heavier rated west lake tires. The lower rated tires were issue as the tire was maxed out. Nobody ever talks about the tire rating just CHina bombs. West lake now has higher rating tires that are capable of the load. It’s like saying ford is sh1t because you can’t pull your fiver with a Ford ranger. Of course you can’t cause the ranger is not rated enough.
If the tire is rated at 75 mph it is probably rated at higher load as well. Our westlakes are E rated and about to be replaced with Sailuns after 3 years.