IMHO the best thing one can do to help avoid blowouts on a TT is to install a TPMS. One a trailer you have NO clue a tire has suffered a puncture and is slowly deflating.... Until you hear the explosion.
Myself and several friends all have TPMS systems, each of us has picked up a nail or similar and suffered a slow loss of pressure which the TPMS system caught BEFORE we had a blowout.
In 100K + miles of towing I've yet to have a tire failure, Others that travel with me have anywhere from 50K+ miles on up with no failures, thanks to a TPMS.
I've run Maxxis, Towmax and now Goodyear endurance tires.