1. IMPORTANT: Make sure PiP is not disabled in the game's video options!

2. Place down the "HEMTT" (B_Truck_01_transport_F) with you as the driver in the Mission Editor and hit preview.

3. Use freelook to check the wing-mirrors through the HEMTT's side windows, in 1st person view.

4. Observe that they use the standard environment/reflection map texture.

5. Try different PiP settings ('Low' to 'Ultra') to confirm that the PiP mirrors never show on B_Truck_01_transport_F, regardless of PiP Graphics Settings.

6. Repeat steps 1-4, but change the "HEMTT" for "HEMTT Transport" (B_Truck_01_covered_F)

7. Observe that "HEMMT Transport" driver can see PiP mirrors where the driver of the un-covered "HEMMT" can not, so long as PiP is not disabled.

I have tried B_Truck_01_transport_F with all available PiP Graphics settings from 'Low' to 'Ultra' and the PiP mirrors didn't work on any of them. The environment/reflection map shader would always display on the mirrors, regardless of which PiP settings were applied.

The PiP mirrors display for all PIP Graphics settings on B_Truck_01_covered_F unless PiP is set to 'Disabled' - in which case they use the environment/reflection map shader that permanently appears on B_Truck_01_transport_F's mirrors.

The attached image was taken with PiP setting set to 'Standard' in both trucks.