Bucky
Observer
At 30,000 miles you are already over the UTQC rating for that tire. Over or under inflation is related to load. The explorer tire failures resulted from heat build up because the tires were under inflated for the load they were carrying. unfortunately tread wear is not a direct correlation to the heat build up in a tire. I'm going to assume that you have not found any problems like these: http://www.maxxis.com/media/197662/tire_damage.pdf unfortunately those are problems that arise only after the initiating damage is already done, meaning the tire can be damaged and still be absent those problems. Regardless you should still closely inspect your tires during your stops.
Thanks! I will check the tires at every stop.
(Do you mean UTQG? I can't find anything for UTQC.)
This is the last trip with a heavy load like I've described.
Bucky