At the moment you can disable a vehicle's NV or TI equipment with commands, but you can't check to see whether that's already been done.
In my case, I want my system to disable TI under x circumstances, and then re-enable it later. However, some other system might have previously disabled TI, e.g. for balance reasons, and if my system re-enables it, something that shouldn't have TI now does have it. If I could check the vehicle's TI state at the beginning, I could save it and choose not to re-enable it. Unfortunately, without a getter command, I just have to hope for the best.
NVGEquipmentDisabled _vehicle; // true if disabled, false if enabled TIEquipmentDisabled _vehicle; // true if disabled, false if enabled
You could also reverse it:
NVGEquipmentEnabled _vehicle; // true if enabled, false if disabled TIEquipmentEnabled _vehicle; // true if enabled, false if disabled