More thoughts on tires:
The more I think about the recent tire debate, the more I think we have been comparing apples to oranges all along.
A pulling track is a far cry from a soybean field (plow day). How a tire responds to a groomed, packed, clay track cannot be directly compared to the performance in loose/sun baked/trash laden soil. Tires can easily be compared "side by side" on the pulling track, but what works under those conditions may not be the same animal out in the field, especially when you consider the 13" hitch height and controlled pulling geometry of a pull, not something that remains consistent in the field.
All of that said; Side by side comparisons are the only "hard" data we have to evaluate, as plow days offer way too many variables.
Firestone 23 deg tires are a favorite for many, and with good reason.....the design has a stellar reputation in the big farm field and on the track. However; many of the new "metric" farm tires imitate the Tru-Power type design, and they work well also.
"Purpose" may be more important on a GT. While I have never tried it, I doubt "Pit Bull" or Cepek pulling tires would be a big hit at plow day......just like Tru-Powers are not the favorite on the track. The specialty pulling tires, designed to spin fast and take controlled little bites of a packed clay track, don't perform the same in the field because there is no nice track to chop up into little bites, just trash to bridge the lugs, and occasionally mud to pack them full....purpose, purpose, purpose.......
My personal opinion on tires for a real world GT has more to do with weight than anything else. I have found it VERY difficult to put enough weight on a GT to make any decent tire "fail" to perform...they all eventually give up traction due to the weight limitations, and rapidly shifting weight distribution on a GT. Without the pulling hitch height adding to the tractive effort, and factoring in the loose slippery trash in a Plow Day field......all of the decent ag tires out there do a respectable job in the field.....and certainly there are more variables out in the field.....too many to make a clear cut winner out of a tire design.
Sooooooooo.......Listen to the opinions of those you trust, make sure your uses match the conditions that they have developed those opinions under.......and then PICK THE TIRE YOU THINK LOOKS AND THE COOLEST AND WILL WORK THE BEST!!!
Then weight it up and go play in the dirt!!!!!!