Well, time for me to fess up. We took a trip to Colorado over the week of labor day and one of my Maxxis tires has started to fail. My wife spotted it as we were leaving the campground to head home (Hey! look at this tire!), so I changed in the campground. It has just started to separate the tread, the tire has noticeable cracks in one spot at the corner between the sidewall and tread; the tread at that point has a bulge to it. I checked the air pressure just before we left, and bought one of those IR temp guns and used it every stop on the way up, no problems spotted. So no damage to the trailer, but that one is going back to discount tire for warranty. This particular tire is only 3 years old. So now I'm considering 16" rims and Michelin LT tires.
The problem is, the Michelin tires on the truck have so much sidewall cracking, that chunks of rubber have started coming out of one of the tires. These tires came on the truck when I bought it new, but the truck was 2 years old when I bought it. Date code on the tires is 2907, which is about right considering when the truck was built. I've only put 18k miles on the truck, so there's lots of tread left but the tires. I'll see what I can get for warranty.
Is there a good water based tire goop that would help with the sidewall cracking? Or do I need to buy RV style tire covers for the truck?