Good topic - just finished 1100mi from VA-KY and back, and I don't think I saw a single tire issue honestly.
We headed down late Wed, so didn't see much activity, but we counted 162 RVs of various types on the trip home (the last few hours at night everyone was already off the roads and it's hard to see them oncoming, so it was probably closer to 200!) Just a fun game we play (did boats too. :)
No one hauling really passed us, except a giant class a towing a ~25' trailer! Figured that means everyones doing about the same 60-65, though it's really difficult along I-64 as the speeds constantly vary with the 5-7% grades. I'll admit that I hit 70 a couple times downhill just ahead of some of the steepest grades, but that seemed to be par for the course with everyone.
On flat ground the tractor trailers were all doing 75-80 out here, which gets annoying when they blow by you. Generally I see them, but sometimes I'll miss one.