Why does it appear that your truck is reflecting the garage cubemap and not the default or even the relight ones? What map is that so I can test out what's happening.
The changes I made in no particular order:
-Increased Sun brightness to double strength during clear weather and then ramping down with each variation
Example. Clear weather 2.0 Slightly cloudy 1.25 Cloudy 0.25 Heavy cloud 0, So it won't be that bright all the time. There is 12 weather presets that evenly lessen the strength of the sun brightness from 2.0 to 0. I also give the sun and moon 380 degrees of rotation so you actually get real sunrises and sunsets with no jerky switching like you do in default. The trade off is I couldn't have a shadow map for the night sky but that didn't matter to much since I wanted it fairly dark if not pitchblack like I've experienced in real life.
-Custom cubemaps that more accurately bounce the color of the environment. Intentionally blurred the reflection images to avoid reflective surfaces becoming very strong mirrors.
-Auto exposure adjustments, kinda boring but I stopped the image from getting flattened out
-Greatly reduced this annoying ambient light that was applied to all objects making things feel cartoony and flat which a lot of people complained about.
-Adjustments to the colors of sky during day/night and sunrise/sunsets
-Got rid of color correction, didn't need it
I can't remember more off the top of my head but those are the main ones.