I've created a mod called "GTM Fixes" that is available here on Steam that fixes the following issues on all 3 GTM trucks:

Hood mirror height
GPS screen backlight adjustment
Info center display adjustment
Interior shadows support
Bad audio reverberation inside the cab
Bad headlights
Incorrect lighting in mirrors
Numerous warnings in the game log file

After subscribing to the mod, go into your mod manager, enable the mod and position it anywhere above the truck mod.

Here is a direct link to GTM Fixes here on Steam:

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3607234862