So I ran BG: DiA. I didn't really make that many alterations to the rules(with the exception that I treated Threshold damage as damage reduction, otherwise certain PCs would've been able to smash the vehicles apart too easily).

The other would be how much resource management you want with them. My PCs seemed pretty interested in traveling around Avernus, so I set up a heist encounter where they could get enough soul coins to take themselves around Avernus.

One suggestion I would make for any combat encounters is have one map with a larger scale to represent the vehicles' movement and another standard scale map to represent movement on/within the vehicles(or Theater of Mind it).