People in blue collar positions do not have a garage for their work vehicle. Nor do they drive those vehicles outside of their job. They are not cared for. They might not be "trashed" but they are certainly not meticulously maintained.
I disagree. Sure there are some who don't care for their work vehicle, but there are some who do care. Plenty of the work vehicles around my neighbourhood (there are a lot) are in good shape and look clean.