I'm curious about the comment about the nail in the tire having anything to do with the brand of tires on the trailer. I'm pretty sure nails are not overly particular on what brand of tire they go into, as for the delivery driver hitting the nail, kind of hard to see a nail in the freeways. Just my $0.02.
The comment was for all the people that claim trailers are being delivered with china bombs. Many times tires fail because of damage done to trailer tires while the unit is being delivered to the dealer. It could be a nail, hitting a pot hole or excess speed.