Since there is such a dearth of good tire info out there, I think the bottom line for r.r. is to select the lowest load range tire you can get away with and air it up to max sidewall psi, if not a little more if that's what you want. Oh, and get the most "ribby" (least "blocky) tread design you can find.
Or if you're like me and don't mind using the spare from time to time, run old nearly worn out tires.
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