Dennis F- I was unaware that Firestone [Akron, Ohio] no longer produces tires in the States for our IH Cub Cadets. My Carlisle Tru-Powers are made here, in the States [Middlefield, Ohio formally]. Secondly, about the automotive industry and Firestone complaint which I remember happened in 2000 with the famous Ford Explorer. To add insult to injury, Firestone argued in court about their manufacture's recommended tire pressure, verses the automotive manufacture's recommended tire inflation. I was surprised you did not make mention of this in your post. That really put out the fire for Firestone. In N.E Ohio, there are many auto manufacturing facilities, so the news was wide-spread, and lots of worries about Firestone tires in general, which was nationally a concern. Similar to how Toyota lost it's number one title to "largest auto manufacture", to GM. I have not bought any Firestone since, and probably won't either, and believe you when you say what you use today are quite well.
As for a pulling tire when it comes to using an IH Cub Cadet, I know little about the sport and have zero reason to doubt anyone of you regarding your comments and opinions about tires. I do know, however, that the wider the lug on that ag tire, the less traction you will produce. I enjoy pulling, and watching. The stock model 71 with original GY 23 x 8.5 GY turf including 50# wheel weights per side, pulling a new transfer sled in the 10hp.& under/850 class yielded 84 feet running in first gear! Though I'm on the purest side when it comes to these garden tractors.