According to the basic 'basics', always before hitting the print button, make sure you physically look at the vehicle and make sure none of the smaller copy is in hard to 'get at' areas. Not hitting fender flares or other obstacles which might not show up in a photograph. Try to avoid hinges and other things which will distort copy. As you get more under your belt, these things will all make sense.
Had a professional designer..... new to the company make the designs for the 'new' look of their fleet. She sure was new. She had things crooked and all over the place. When the trucks got here, I called her about these things and her response was, do it exactly as I gave it to you. Okay. Got all 3 trucks done and one of the vice presidents and her asked me to come out. He said this sh!t is Unacceptable. I said, this is what I was told to do and he said he didn't care, I should've corrected anything I saw wrong. I said there's so much wrong and I tried, but to deaf ears. In my face, she said I never set it up like that. You're fired and you're not getting paid for this mess. She actually photo-shopped things off the original photo of the truck to make her design look good, but in real time, it didn't work. So, be careful.