In the automotive industry (at least among german OEMs which I'm familiar with) CanTP was used for bigger messages. I'm guessing that the Autosar Stack that is

In the automotive industry (at least among german OEMs which I'm familiar with) CanTP was used for bigger messages. I'm guessing that the Autosar Stack that is now commonly used incorporates that or a replacement for it. Don't know if Tesla uses Autosar, but it would make sense.