***The only perfect placement on a vehicle is one where you take a picture of the vehicle and superimpose your
graphics on it & have the customer sign off on it.
Yes! And most of the time, the 2 sides are different so you should always make sure to show them both sides. The vehicle could be exactly the same on both sides but depending on the shape of the logo and the wording being applied, it needs adjusting on one side or the other. After the first vehicle a person letters, they find this out real quick LOL ie: bullets points in list form on a minivan rear window...fits great on the drivers side but the passenger side might need some adjusting.
I have to add one caveat to my "perfect placement": before digital cameras were really a thing, I had a vinyl install on a van. I taped all the graphics in place before applying and showed the customer, he approved & was happy when he picked it up...
but when he brought it back to his business, his wife and daughter convinced him that the graphics were crooked.
He actually thought I should redo the van free of charge, that was a big fat NOPE.
The Lesson: If the customer is a man & his wife/daughter works there too, make sure she/they approve too if you can