That is correct it would only be able to support one vehicle. You can test SITL multi vehicles on your parent computer running SITL, however the modules and drivers running in that environment would differ from what is running on the voxl2.
@Moderator Besides extracting out the libraries and running them on an ARM based computer, how else can we simulate VOXL's behaviour? From what I understand for HITL, we are only interfacing with voxl-px4 but not other services like voxl-vision-hub.
@kerct Not that I am aware of. You could look into Gazebo and see if there is a way to add that. Or you could create your own Gazebo extension to do this.