I leave the pressures in my occasionally used trailer tires pretty high and I have wondered how high the pressure may go on hot sunny days. I suspect that it'd be better to let it sit with low pressures and then top them up for the load I'm going to carry. No real need to run near max pressures for light loads. It would even be better for me to keep them out of the sun.

I don't know what type of belts the old tires had. This summer there was a lot of blasting along the highway near our camp. We got a few chunks of old tires form the blasting mats in our yard. Most were steel belted and I remember noticing that the exposed belting seemed rusted. Huge amounts of salt are used on the highways around here. I don't know if that's an issue for old steel belted tires, and I don't know the life of an old tire used in a blasting mat. Something to think about.

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