Bounding Box - NeisesMike/VehicleFramework GitHub Wiki
The bounding box tightly encloses your vehicle.
It is used to detect when the player has "fallen out" of your vehicle and to describe to the Building Bots how they should fly.
Overview
ModVehicle has the field:
public virtual BoxCollider BoundingBoxCollider { get; set; }
This is simply a BoxCollider that you provide. Vehicle Framework will occasionally turn it on and off in order to check its bounds, but you don't need to worry about that.