Hi there,
I would highly recommend uninstalling the .4 version of ror (as the game has recently been updated about a couple days ago) and installing the newest version (aka 2020.02). Also, any trucks that have white textures (white tires, white chassis, white marks on the body, etc.), means that the truck is highly outdated for the version of ror that is being used. Once again I would highly recommend deleting any trucks that have that issue. If the problem still persists, then contact me via Discord (Chaos2TheMax#8628) and I can guide you through resolving the issue.
Thank you and have a great day!