In your Rockwood's tire size ST225/75-15 we have radial trailer tire options in various load ranges and some of these also have the M speed rating you're looking for. An M-rated tire is good to 81-mph. The available tires in your size, shown on the linked page, include Load Ranges C, D and E and using a higher-weight-rated tire is a great way to help reduce heat-related tire failure.
You can determine the appropriate load range tire by taking the RV's GVWR (not its dry weight) and dividing... view full answer...
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