Randy,
The answer to your question really depends on what your mission is between the departure from that Kentucky grass strip and your return. Oh, yeah, and how much you want to spend.
Are you generally poking around, and landing at various small airports, etc? Or, are you thinking of getting into off airport operation, like river gravel/sand bars, hillsides, etc? Those two scenarios suggest very different tires for safety.
If your plan is to do virtually all "airports", which includes private grass strips, then either the 8.50 x 6 tires or the 26 inch Goodyear blimp tires will work just fine. The nice thing about these tires is that if and when you do go to a paved runway, there will be near zero wear on these tires.
I prefer Goodyear 8.50 x 6 tires to the "competition". The Goodyears are measurably larger in diameter, and they wear much longer in my experience.
The 26 inch Goodyears are a lot more expensive than 8.50s (the 26 inch tires go for about $800 each, but you'll probably never wear them out), but they are somewhat larger in both diameter and width. They actually are a little smaller in diameter than 26 inches. They are tube type tires, and use 8.50 tubes. Perhaps the biggest advantage of these blimp tires is that they have no tread, so they are less likely to throw junk at your tail feathers, which can cause damage.
That said, not all grass strips are smooth as a baby's butt.....so a little extra cushioning may become desirable as you explore the countryside more and get more comfortable landing in varied sites. That is the major advantage of the Alaska Bushwheels: They are tubeless tires (they're actually built like a big donut, so can be used on split type wheels) and their sidewalls are VERY flexible, which allows them to roll over irregularities on a landing surface. And, as I said, some "air strips" can be pretty rough, so that cushioning can make a lot of difference in wear and tear on the airframe.
Bushwheels come in sizes of 26, 29 and 31 inch, and those measurements are actually pretty accurate in the actual tires. These are beautiful tires when operating off airport, and even on many rough strips. The single biggest down side is their price. The good news is they are still doing free shipping. Here's their web site:
https://www.airframesalaska.com/Alaskan_Bushwheels_a/263.htm.
So, whatever your mission is, and how much damage your wallet can sustain.....
MTV