The driver camera in addon vehicles doesn't succumb to g-forces.

With pretty much every addon vehicle I drive, the g-force effect (which you can change the intensity of in the camera settings) doesn't ever seem to work. Works in vanilla cars just fine, but not in addon cars. The "Lock to Horizon" thing works though.

 

That is up to the mod makers if they implement this feature fair enough, if not you will need to contact them.

 

The driver camera is placed on a node in the stock vehicles. That slider makes the beams holding that node stiffer or weaker depending on how you adjust the slider. Mod makers might not make the camera node correctly or label the beams the right way (don't know if thats how it works but one can assume) to make them work with the slider.

 

The camera is on a node? That's weird.

 

I might be totally wrong, but thats how I remember someone explaining it before.

 

The addon vehicles need to be modified by the mod maker to add that feature, its not a bug its a missing feature that some modders don't program in