One thing to consider, especially for ST tires which generally have a bad reputation for reliability... In the case of a blowout, If you only have 65 psi in the tires, the remaining tire will most likely be severely overloaded.
To the point that it should be considered damaged and replaced along with the blowout.
If 80 psi is used, the overload (if any) will be a lot less. In my case, I would take it out of service, but use it for a spare.
Blowouts on TTs are problematic. Often they go unnoticed for many miles. The TT usually doesn't tow much different. So lots of damage can be done. Both to a remaining overloaded tire, and to the TT from the steel belts whipping around acting like a chainsaw on the TT.
This why I use Michelin XPS RIBS. Very expensive, and VERY reliable.