As the title, im attempting to create road trains using vanilla assets (for now). As a test, i used the Cascadia, since it was one of the simplest articulated truck mdl's.

For the most part they run well. I fixed the lights and bounding in the model editor, and made sure the fake bogies were in the correct places. Civilian cars pull up behind them and wait, or overtake without issue for the most part;

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3431493365

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3431493179

but there are occasions where someone thinks they're Vin Diesel;

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3431493704

or another vehicle drives into the trailer;

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3431493817

These don't happen on open roads between towns, but it's annoying to see in denser traffic and in cities. Adjusting the bounding and collisions have had little effect on solving this

It seems like the issue is that once the "tractor" unit has turned on a junction, or passed a set of traffic lights, it turns the indicators off pre-maturely, so the vehicles behind think the whole truck has already moved past. Once they're out on the open road again, things go back to working correctly, and they all stop behind one another.

The bounding box is the correct size, judging by other vanilla models, and the collision box, from what i've seen is for assets..? and changing it makes no difference.

I double checked the fake bogies, the positions of the trailers, the model alignment... im out of idea's at this point.

What am i missing here? Or am i just trying to do something that will never work...?