Right now every MTS vehicles have an entity Identifier name that goes like this:
entity.mts_entity.name(on 1.12.2) and
mts.builder.existing(on 1.16.5).
You can kill the vehicles by running: {"/kill @e[type=mts.builder.existing]"} but you can't summon them, because running "/summon mts.builder.existing" brings up an invisible fake entity.
What i want and i'm sure more people are looking toward this feature is to be able to identify each vehicle by the name of their item: mts:packid.name
ex.
Item name: mts:warkvehicle.containerhandler
entity name: mts:warkvehicle.containerhandler

I believe this would help servers in a big way. They could setup minigames, Races, Roleplays and so much more.

Can it be assumed what you actually want is a command to summon vehicles, not them having a unique name specificall?

Can it be assumed what you actually want is a command to summon vehicles, not them having a unique name specificall?

Sorry for not responding.
Yes but i requested entity names as you have multiple minecraft command, ex. kill, tp, execute if entity execute at, etc

They will not have unique names. IV registers vehicles as a single entity. Their JSON defines what they do. So no, you just get the basic names.

If you use the right NBT, yes, you can summon a vehicle now. You don't need anything special for that.

I honestly have no clue. I don't mess with summon commands with NBT normally. Would ask one of the folks who is on servers regularly that do.