Yesterday, I noticed a nail head in one of the trailer tires.
GYE.
No telling how long it had been there, because the tire had to be rotated in the perfect position to see.
I was 120 miles from home, and the last thing I was going to do was pull it out. So I watched the pressure while working my way home. It never lost air.
Now it's possible the nail is just the head and it hasn't punctured the inside.
Unless it's 1/16" I'm swapping the tire. I may keep it as a spare and mount up the current spare.
I'll know when I pull it out.