Don't know many straights or TT's that carry spares
know a few vanners that dumped the spare in the name of "payload" and winged it with a plug kit and air pump..
Under my van there is a full size spare ready, willing and able. I use to trust the oil change guys to check the pressure like they said they did till one day I needed it and it was flat.
Then I busted out the foot pump, inflated it, used it and when I dropped the van off to have the tire repaired I mentioned the flat spare... The guy finely admitted he had not checked it.
He did fix it.. And I did not pay for either flat repair that day.