I tried to do a Batmobile as a Dominus and its my first one c=. The hole car is black and i colored it in white. You cant switch the color.
!Be sure that you selected the DOMINUS with WINGS and second color WHITE, also set your settings ( texturedetails ) to HIGH QUALITY!
1) Install uMod ( https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/texmod/uMod_alpha_v2_r49.zip)
2) Tick global hook ( uMod -> Main -> Use global hook )
3) Add Rocket League ( uMod -> Main -> Add game ) you'll find the game here C:Program Files (x86)SteamsteamappscommonrocketleagueBinariesWin32
4) If you Launch Rocket League now there should open a new tab, go there and extract both files that u find in the DDS Files Folder