I painted this truck 15 months ago and I have a problem that came up about a month or more after he started driving it to the mines, He called me and said I needed to look at the truck. The truck had 2 inch wheel spacers at the time and he had put on new BFG tires, The road coming out of the mine is gravel and he told me that he could hear the gravel hitting the truck as he pulled out on the highway. I told him that gravel was the problem and he asked if the clear "Euro" could have been bad or not activated to cause the places on the doors, I told him there was no way because the rest of the truck looks really good, What is your opinion? Do you agree that gravel started the issue or not? I am going to fix the truck and was wandering if I could chip guard the bottom of the doors the same color as the truck? He also asked if I could rino line the bottom of the doors in the same color? He also asked if I could clear over the rino liner or chip guard? I appreciate any and all help.