I like to work on truck model kits (big rigs from the 70s and 80s) but when it comes to put the license plates decals, I don't know exactly where to put them (front, back of truck, back of cab??) or how many to use. These kits come with several of these decals, in different colors, different States, etc. What is the correct way to use them in the real world? I've seen trucks with several different plates in the front bumper. And I've seen others with nothing in the back of the truck.