Hello all! Its finally time for a new tire on the rear, ~15K mi on my 2018 RT (and it really was overdue)! Rhetorically, I find it interesting that the wear is so uneven across the tread. Hmmm!
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After a thorough look at the options available I'm going with the latest General AltiMAX RT45.
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The OEM fronts are not down to the wear indicators so I'm staying with those for now.
Not wanting to start another conversation here, but the only spec I have
not seen comments on is the speed rating. The AltiMAX is T-rated and the Kenda (and some other "appropriate" car tires) are H-rated. The way I look at it, it doesn't really matter... who's going over 118MPH (T), let alone 130MPH (H)

on their RT; this is a cruiser, not a race car! I'll post some more technical results (later) on the other "What Tires are on YOUR Spyder" thread. I also included below a tire size comparison (which has been discussed) that I found helpful in visualizing the difference between the OEM Kenda and my size choice.
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Thanks to all for the many thoughts on tires that helped me come to this decision!