when theres trucks or wider cars loaded, the sides of the cars are closer to your overspray which creates a better chance of getting spray on them. If you ever have the chance to get inside an empty autorack with peices on them in the daylight you can see on the floor how far the overspray goes and its really not that far. As far as getting traced back to your spot i dont have much info, but ive been loading and unloading them for the past two years and that has never been an issue at my yard yet.