Funny how we were just talking about nails in tires in another thread, and a day later I get this:
It's on an ST (trailer) tire, Load Range D. Found the nail at a gas stop and pulled it out. Aside from the two holes in the rubber where the nail went through, the tire appears undamaged and isn't leaking any air.
I suppose the sidewall plies could have been scuffed up a bit and maybe weakened, but I'm regularly checking for blisters or bubbles, and so far everything looks fine. Gas stops are every 350-400 kms, so it gets checked often.
It's been a week now and over 1,500 kms of highway travel since it happened, and tire still looks fine and hasn't lost any air.